Planetary gear train of automatic transmission for vehicle

Patent metadata

Field	Value
Publication number	US-10619709-B2
Application number	US-201815953645-A
Country	US
Kind code	B2
Filing date	Apr 16, 2018
Priority date	Dec 5, 2017
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

A planetary gear train of an automatic transmission may include input and output shafts, first to fourth planetary gear sets respectively having first to third, fourth to sixth, seventh to ninth, and tenth to twelfth elements, a first shaft fixed with the input shaft, the third element, and the fifth element, a second shaft fixed with the ninth and eleventh elements, and selectively connectable to the input shaft, a third shaft fixed with the eighth and twelfth elements, and the output shaft, a fourth shaft fixed with the first element, a fifth shaft fixed with the second and sixth elements, a sixth shaft fixed with the tenth element, and a plurality of shafts, each of which is selectively connectable to a housing and fixed to an element of the first and second gear sets which is not fixed with any of the first to sixth shafts.

First claim

What is claimed is:

1. A planetary gear train apparatus of an automatic transmission for a vehicle, the apparatus comprising:
an input shaft receiving an input torque;
an output shaft outputting a shifted torque;
a first planetary gear set having a first rotation element, a second rotation element, and a third rotation element;
a second planetary gear set having a fourth rotation element, a fifth rotation element, and a sixth rotation element;
a third planetary gear set having a seventh rotation element, an eighth rotation element, and a ninth rotation element;
a fourth planetary sear set having a tenth rotation element, an eleventh rotation element, and a twelfth rotation element;
a first shaft fixedly connected to the input shaft, the third rotation element, and the fifth rotation element;
a second shaft fixedly connected to the ninth rotation element and the eleventh rotation element, and selectively connectable to the input shaft;
a third shaft fixedly connected to the eighth rotation element, the twelfth rotation element, and the output shaft;
a fourth shaft fixedly connected to the first rotation element;
a fifth shaft fixedly connected to the second rotation element and the sixth rotation element;
a sixth shaft fixedly connected to the tenth rotation element; and
a plurality of shafts, each of which is selectively connectable to a transmission housing and fixedly connected to a rotation element of the second and third planetary gear sets which is not fixedly connected to the first to sixth shafts,
wherein the plurality of shafts includes:
a seventh shaft fixedly connected to the fourth rotation element and selectively connectable to the transmission housing; and
an eighth shaft fixedly connected to the seventh rotation element and selectively connectable to the transmission housing, and

wherein the input shaft and the second shaft are selectively connectable to each other, the fourth shaft and the sixth shaft are selectively connectable to each other, the fifth shaft and the sixth shaft are selectively connectable to each other, and the fifth shaft and the eighth shaft are selectively connectable to each other.

2. The planetary gear set of claim 1 , further including:
four clutches each selectively interconnecting a corresponding pair among the input shaft and the first to eighth shafts; and
two brakes selectively connecting the seventh shaft and the transmission housing and selectively connecting the eighth shaft with the transmission housing, respectively.

3. The planetary gear set of claim 2 , wherein
the four clutches comprise:
a first clutch mounted between the input shaft and the second shaft;
a second clutch mounted between the fourth shaft and the sixth shaft;
a third clutch mounted between the fifth shaft and the sixth shaft; and
a fourth clutch mounted between the fifth shaft and the eighth shaft, and
the two brakes comprise
a first brake mounted between the seventh shaft and the transmission housing; and
a second brake mounted between the eighth shaft and the transmission housing.

4. A planetary gear train apparatus of an automatic transmission for a vehicle, the apparatus comprising:
an input shaft receiving an input torque;
an output shaft outputting a shifted torque;
a first planetary gear set having a first rotation element a second rotation element, and a third rotation element;
a second planetary gear set having a fourth rotation element, a fifth rotation element, and a sixth rotation element;
a third planetary gear set having a seventh rotation element, an eighth rotation element, and a ninth rotation element;
a fourth planetary gear set having a tenth rotation element, an eleventh rotation element, and a twelfth rotation element;
a first shaft fixedly connected to the input shaft, the third rotation element, and the fifth rotation element;
a second shaft fixedly connected to the ninth rotation element and the eleventh rotation element, and selectively connectable to the input shaft;
a third shaft fixedly connected to the eighth rotation element, the twelfth rotation element and the output shaft;
a fourth shaft fixedly connected to the first rotation element;
a fifth shaft fixedly connected to the second rotation element and the sixth rotation element;
a sixth shaft fixedly connected to the tenth rotation element; and
a plurality of shafts, each of which is selectively connectable to a transmission housing and fixedly connected to a rotation element of the second and third planetary gear sets which is not fixedly connected to the first to sixth shafts,
wherein the first planetary gear set is a single pinion planetary gear set having a first sun gear, a first planet carrier, and a first ring gear as the first rotation element, the second rotation element, and the third rotation element, respectively;
wherein the second planetary gear set is a single pinion planetary gear set having a second sun gear, a second planet carrier, and a second ring gear as the fourth rotation element, the fifth rotation element, and the sixth rotation element, respectively;
wherein the third planetary gear set is a single pinion planetary gear set having a third sun gear, a third planet carrier, and a third ring gear as the seventh rotation element, the eighth rotation element, and the ninth rotation element, respectively; and
wherein the fourth planetary gear set is a single pinion planetary gear set having a fourth sun gear, a fourth planet carrier, and a fourth ring gear as the tenth rotation element, the eleventh rotation element, and the twelfth rotation element, respectively.

5. A planetary gear train apparatus of an automatic transmission for a vehicle, the apparatus comprising:
an input shaft receiving an input torque;
an output shaft outputting a shifted torque;
a first planetary gear set having a first rotation element, a second rotation element, and a third rotation element;
a second planetary gear set having a fourth rotation element, a fifth rotation element, and a sixth rotation element;
a third planetary gear set having a seventh rotation element, an eighth rotation element, and a ninth rotation element;
a fourth planetary gear set having a tenth rotation element, an eleventh rotation element, and a twelfth rotation element,
wherein the first rotation element is selectively connectable to the tenth rotation element,
the second rotation element is fixedly connected to the sixth rotation element, and selectively connectable to the seventh rotation element and the tenth rotation element, respectively,
the third rotation element is fixedly connected to the fifth rotation element and the input shaft,
the fourth rotation element and the seventh rotation element are selectively connectable to a transmission housing respectively,
the eighth rotation element is fixedly connected to the twelfth rotation element and the output shaft,
the ninth rotation element is fixedly connected to the eleventh rotation element, and selectively connectable to the input shaft.

6. The planetary gear set of claim 5 , further including:
four clutches each selectively interconnecting a corresponding pair among the input shaft and the first to eighth rotation elements; and
two brakes selectively connecting the fourth rotation element and the seventh rotation element to the transmission housing respectively.

7. The planetary gear set of claim 6 , wherein
the four clutches comprise:
a first clutch mounted between the input shaft and the eleventh rotation element;
a second clutch mounted between the first rotation element and the tenth rotation element;
a third clutch mounted between the second rotation element and the tenth rotation element; and
a fourth clutch mounted between the sixth rotation eleme

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Ji Seongwook
• KWON Hyun Sik
• Cho Wonmin
• Hwang Seong Wook
• Kim Ki Tae

Classifications

• F16H2200/2046

  with six engaging means · 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

• F16H2200/2012

  with four sets of orbital gears · CPC title