Planetary gear train of automatic transmission for vehicle

Patent metadata

Field	Value
Publication number	US-10641360-B2
Application number	US-201816178767-A
Country	US
Kind code	B2
Filing date	Nov 2, 2018
Priority date	Jun 25, 2018
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

A planetary gear train may include: an input shaft; an output shaft; a first planetary gear set including first, second, and third rotation elements; a second planetary gear set including fourth, fifth, and sixth rotation elements; a third planetary gear set including seventh, eighth, and ninth rotation elements; a fourth planetary gear set including tenth, eleventh, and twelfth rotation elements; four clutches, each selectively connecting at least one of the first to twelfth rotation elements to another rotation element or the input shaft; and two brakes, each selectively connectable at least one of the first to twelfth rotation elements to a transmission housing.

First claim

What is claimed is:

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

2. The planetary gear train apparatus of claim 1 , further including six engaging elements, each selectively connecting one shaft with another shaft among the first to seventh shafts or one shaft among the first to seventh shafts with a transmission housing,
wherein forward speeds or reverse speeds are achieved by operating, in combinations of three engaging elements, the three engaging elements among the six engaging elements.

3. The planetary gear train apparatus of claim 2 , wherein the six engaging elements comprise:
four clutches, each selectively connecting two shafts among the input shaft and the first to seventh shafts; and
two brakes, each selectively connecting one shaft among the first to seventh shafts which is not connected to the output shaft with the transmission housing.

4. The planetary gear train apparatus of claim 2 , wherein the six engaging elements comprise;
a first clutch mounted between the input shaft and the first shaft;
a second clutch mounted between the input shaft and the second shaft;
a third clutch mounted between the third shaft and the fourth shaft;
a fourth clutch mounted between the fourth shaft and the seventh shaft;
a first brake mounted between the sixth shaft and the transmission housing; and
a second brake mounted between the seventh shaft and the transmission housing.

5. The planetary gear train apparatus of claim 1 ,
wherein each of the first, second, third, and fourth planetary gear sets is a single pinion planetary gear set,
wherein 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,
wherein 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,
wherein 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
wherein the tenth rotation element is a fourth sun gear, the eleventh rotation elementa fourth planet carrier, and the twelfth rotation element is a fourth ring gear.

6. The planetary gear train apparatus of claim 1 ,
wherein each of the first, second, and third planetary gear sets is a single pinion planetary gear set,
wherein 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,
wherein 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,
wherein 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,
wherein the fourth planetary gear set is a double pinion planetary gear set, and
wherein the tenth rotation element is a fourth sun gear, the eleventh rotation element is a ring gear, and the twelfth rotation element is a fourth planet carrier.

7. The planetary gear train apparatus of claim 1 , wherein the first, second, third, and fourth planetary gear sets are disposed in a sequence of the first, second, third, and fourth planetary gear sets from an engine side thereof.

8. A planetary gear train apparatus of an automatic transmission for a vehicle, the planetary gear train apparatus comprising:
an input shaft receiving torque of an engine;
an output shaft outputting 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;
a first shaft fixedly connected to the third rotation element and selectively connectable to the input shaft;
a second shaft fixedly connected to the fourth rotation element and selectively connectable to the input shaft;
a third shaft fixedly connected to the twelfth rotation element and the output shaft;
a fourth shaft fixedly connected to the first rotation element, the sixth rotation element, and the eighth rotation element;
a fifth shaft fixedly connected to the ninth rotation element and the tenth rotation element; and
a plurality of shafts formed by combinations of remaining rotation elements among the first to twelfth rotation elements of the first, second, third, and fourth planetary gear sets that are not connected to the first to fifth shafts, and each thereof selectively connectable to a transmission housing.

9. The planetary gear train apparatus of claim 8 , wherein the plurality of shafts includes:
a sixth shaft fixedly connected to the second rotation element, the fifth rotation element, and the eleventh rotation element; and
a seventh shaft fixedly connected to the seventh rotation element.

10. The planetary gear train apparatus of claim 9 , wherein the third shaft is selectively connectable to the fourth shaft and the fourth shaft is selectively connectable to the seventh shaft.

11. The planetary gear train apparatus of claim 10 , further including:
a first clutch mounted between the input shaft and the first shaft;
a second clutch mounted between the input shaft and the second shaft;
a third clutch mounted between the third shaft and the fourth shaft; and
a fourth clutch mounted between the fourth shaft and the seventh shaft.

12. The planetary gear train apparatus of claim 9 , further including two brakes, each selectively connecting one of the sixth shaft and the seventh shaft to the transmission housing.

13. The planetary gear train apparatus of claim 12 , wherein the two brakes comprise:
a first brake mounted between the sixth shaft and the transmission housing; and
a second brake mounted between the seventh shaft and the transmission housing.

14. The planetary gear train apparatus of claim 8 ,
wherein each

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Yoo Ilhan
• Ji Seongwook
• Park Juhyeon
• KWON Hyun Sik
• Hwang Seong Wook
• Kim Ki Tae

Classifications

• F16H3/66

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

• F16H3/666 Primary

  with intermeshing orbital gears (F16H3/663 takes precedence) · CPC title

• F16H2200/2046

  with six engaging means · CPC title

• F16H2200/0069

  the gear ratios comprising ten forward speeds · CPC title

• F16H2003/445

  without permanent connection between the input and the set of orbital gears · CPC title