Six-speed double clutch transmission for vehicle

Patent metadata

Field	Value
Publication number	US-2018106332-A1
Application number	US-201715695820-A
Country	US
Kind code	A1
Filing date	Sep 5, 2017
Priority date	Oct 17, 2016
Publication date	Apr 19, 2018
Grant date	—

Abstract

A six-speed includes first and second input shafts and on which drive gears are disposed, an idler shaft on which idler drive gears are disposed, and first and second output shafts on which driven gears are disposed. The whole length of the DCT is formed such that an upper whole length section is reduced by the length of a second output shaft that is reduced by disposing the sixth-speed and reverse driven gears on the second output shaft, or an intermediate whole length section formed between the upper and lower whole length sections is reduced by the length of the first input shaft that is reduced by disposing the fifth-, sixth- and reverse driven gears on the second output shaft.

First claim

What is claimed is:

1 . A six-speed double clutch transmission including an input element from a power source, a first clutch and a second clutch, a first input shaft and a second input shaft each functioning as an input element of the transmission, and a first output shaft, a second output shaft and an idler shaft each functioning as an output element of the transmission,
wherein the first input shaft and the second input shaft are coaxially disposed, the first input shaft is selectively coupled to the input element through the first clutch, and the second input shaft is selectively coupled to the input element through the second clutch, wherein one or more drive gears are disposed on each of the first input shaft and the second input shaft, one or more driven gears are disposed on each of the first output shaft and the second output shaft, and one of the drive gears and a corresponding one of the driven gears are continuously-connected to each other by external engagement to form a gear pair, and transmit drive force of the input element to a drive shaft of a vehicle through a plurality of gear shifting devices, thus embodying a forward gear shift stage, and wherein one drive gear disposed on the first input shaft externally engages with one driven gear disposed on the idler shaft, thus forming a continuously-connected gear pair, the one driven gear is selectively coupled to one or more drive gears disposed on the idler shaft through a separate gear shifting device, one drive gear disposed on the idler shaft externally engages with one drive gear disposed on the second input shaft, thus forming a continuously-connected gear pair, and drive force from another drive gear disposed on the second input shaft is transmitted to the drive shaft of the vehicle, thus embodying another forward gear shift stage.

2 . The six-speed double clutch transmission of claim 1 , wherein the first input shaft is a solid shaft, and the second input shaft is a hollow shaft.

3 . The six-speed double clutch transmission of claim 1 ,
wherein the drive gears of the first input shaft and the second input shaft comprise a second-speed drive gear, a third-speed drive gear, a fourth- and sixth-speed drive gear, and a fifth-speed drive gear, wherein the driven gears of the first output shaft and the second output shaft comprise a second-speed driven gear, a third-speed driven gear, a fourth-speed driven gear, a fifth-speed driven gear, a sixth-speed driven gear, and a reverse driven gear, wherein the driven gear on the idler shaft includes a second idler gear, and the drive gears on the idler shaft comprise a first idler gear and a third idler gear, and wherein the gear shifting devices comprise a third- and fifth-speed gear shifting device, a two- and fourth-speed gear shifting device, a sixth- and reverse gear shifting device, and a first-speed gear shifting device.

4 . The six-speed double clutch transmission of claim 3 , wherein the second-speed driven gear, the third-speed driven gear, the fourth-speed driven gear and the fifth-speed driven gear are disposed on the first output shaft, the sixth-speed driven gear and the reverse driven gear are disposed on the second output shaft, and the continuously-connected gear pairs comprise the second-speed drive gear and the second-speed driven gear, the third-speed drive gear and the third-speed driven gear, the fourth- and sixth-speed drive gear and the fourth- and sixth-speed driven gear, the fifth-speed drive gear and the fifth-speed driven gear, the fourth- and sixth-speed drive gear and the first idler gear, and the third-speed drive gear and the second idler gear.

5 . The six-speed double clutch transmission of claim 3 , wherein the third- and fifth-speed gear shifting device selectively connects the third-speed driven gear, the second- and fourth-speed gear shifting device selectively connects the second-speed driven gear, and the sixth-speed and reverse gear shifting device selectively connects the reverse driven gear.

6 . The six-speed double clutch transmission of claim 3 , wherein the first-speed gear shifting device selectively connects the second idler gear with the first idler gear.

7 . The six-speed double clutch transmission of claim 1 ,
wherein the drive gears of the first input shaft and the second input shaft comprise a second-speed drive gear, a third-speed drive gear, a fourth- and sixth-speed drive gear, and a fifth-speed drive gear, wherein the driven gears of the first output shaft and the second output shaft comprise a second-speed driven gear, a third-speed driven gear, a fourth-speed driven gear, a fifth-speed driven gear, a sixth-speed driven gear, and a reverse driven gear, wherein the driven gear on the idler shaft includes a second idler gear, and the drive gears on the idler shaft comprise a first idler gear and a third idler gear, and wherein the gear shifting devices comprise a third-speed gear shifting device, a two- and fourth-speed gear shifting device, a sixth-speed and reverse gear shifting device, a first-speed gear shifting device, and a fifth-speed gear shifting device.

8 . The six-speed double clutch transmission of claim 7 , wherein the second-speed driven gear, the third-speed driven gear and the fourth-speed driven gear are disposed on the first output shaft, the fifth-speed driven gear, the sixth-speed driven gear and the reverse driven gear are disposed on the second output shaft, and the continuously-connected gear pairs comprise the second-speed drive gear and the second-speed driven gear, the third-speed drive gear and the third-speed driven gear, the fourth- and sixth-speed drive gear and the fourth- and sixth-speed driven gear, the fifth-speed drive gear and the fifth-speed driven gear, the fourth- and sixth-speed drive gear and the first idler gear, and the third-speed drive gear and the second idler gear.

9 . The six-speed double clutch transmission of claim 7 , wherein the third-speed gear shifting device selectively connects the third-speed driven gear, the second- and fourth-speed gear shifting device selectively connects the second-speed driven gear, the sixth-speed and reverse gear shifting device selectively connects the reverse driven gear, and the fifth-speed gear shifting device selectively connects the fifth-speed driven gear.

10 . The six-speed double clutch transmission of claim 7 , wherein the first-speed gear shifting device selectively connects the second idler gear with the first idler gear.

11 . The six-speed double clutch transmission of claim 1 , wherein the power source includes a motor generator.

Assignees

• Hyundai Motor Co Ltd
• Kia Motors Corp

Inventors

• Lee Sueng-Ho
• Lee Kyeong-Hun
• Hwang Seong-Wook
• Kim Ki-Dong
• Lee Ji-Hun
• Kang Ma-Ru
• Yoo Il-Han
• Eo Soon-Ki
• Choi Yong-Seok
• Kim Chon-Ok

Classifications

• F16H3/0915 Primary

  with coaxial input and output shafts · CPC title

• F16H3/006

  power being selectively transmitted by parallel flow paths, e.g. dual clutch transmissions · CPC title

• B60W10/113

  with two input flow paths, e.g. double clutch transmission selection of one of the torque flow paths by the corresponding input clutch · CPC title

• F16H61/684

  without interruption of drive · CPC title

• B60K6/547 Primary

  the transmission being a stepped gearing · CPC title