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US 9,772,006 B2Granted
Double clutch transmission
AssigneeHyundai Powertech Co., Ltd.
InventorsCheol Jin Kim, Yeon-Tae Lee
Life of this patent
Estimating the term…
Abstract
A double clutch transmission (DCT) provides eight forward speeds and one reverse speed while minimizing the number of gear trains used for changing speed and the whole length thereof. In particular, the DCT has a simple structure using four or five gear trains and four synchro devices and is capable of providing eight forward speeds and one reverse speed while reducing the entire weight thereof. In a conventional DCT, when a gear train is added to increase the number of speed stages, the whole length thereof is increased. The provided DCT can minimize the whole length and the weight thereof, thereby reducing the manufacturing cost, the number of parts, and the fuel efficiency.
Claims2
A double clutch transmission (DCT) which provides eight forward speeds and one reverse speed, comprising:
- first and second input shafts 10a and 10b selectively receiving power from an engine E/G through a first clutch C1 and a second clutch C2, respectively;
- an output shaft 20 including first and second output shafts 20a and 20b which receive power from the first and second input shafts 10a and 10b, respectively, and output the received power;
- first and second gear trains 30a and 30b mounted on the first input shaft 10a and selectively transmitting power to the output shaft 20;
- third and fourth gear trains 30c and 30d mounted on the second input shaft 10b and selectively transmitting power to the output shaft 20;
- a first synchro device 40a installed on the first output shaft 20a so as to be positioned between the first and second gear trains 30a and 30b and synchronizing the first and second gear trains 30a and 30b to selectively transmit power, and a third synchro device 40c installed on the first output shaft 20a so as to be positioned between the third and fourth gear trains 30c and 30d and synchronizing the third and fourth gear trains 30c and 30d to selectively transmit power;
- a second synchro device 40b installed on the second output shaft 20b so as to be positioned between the first and second gear trains 30a and 30b and synchronizing the first and second gear trains 30a and 30b to selectively transmit power, and a fourth synchro device 40d installed on the second output shaft 20b so as to be positioned between the third and fourth gear trains 30c and 30d and synchronizing the third and fourth gear trains 30c and 30d to selectively transmit power;
- and
- an output gear 50 installed on the output shaft 20 and transmitting an output thereof to a differential device Diff,
- wherein at least one forward speed is configured to be determined by selecting at least two gear trains from the first to fourth gear trains 30a to 30d,
- wherein the first and second input shafts 10a and 10b are provided in the form of dual pipes using hollow shafts and arranged on a coaxial line,
- wherein the first to fourth gear trains 30a to 30d comprise external gears,
- wherein a speed change to a reverse speed is realized as the second clutch C2 is operated, and the third synchro device 40c is engaged with the fourth gear train 30d;
- wherein a speed change to a neutral speed is realized as the second synchro device 40b is engaged selectively with the second gear train 30b, and the fourth synchro device 40d is engaged with the fourth gear train 30d;
- wherein a speed change to a first forward speed is realized as the first clutch C1 is operated, the second synchro device 40b is engaged with the second gear train 30b, and the fourth synchro device 40d is engaged with the fourth gear train 30d;
- wherein a speed change to a second forward speed is realized as the second clutch C2 is operated, and the fourth synchro device 40d is engaged with the fourth gear train 30d,
- wherein a speed change to a third forward speed is realized as the first clutch C1 is operated, and the first synchro device 40a is engaged with the second gear train 30b;
- wherein a speed change to a fourth forward speed is realized as the second clutch C2 is operated, and the third synchro device 40c is engaged with the third gear train 30c;
- wherein a speed change to a fifth forward speed is realized as the first clutch C1 is operated, and the first synchro device 40a is engaged with the first gear train 30a;
- wherein a speed change to a sixth forward speed is realized as the second clutch C2 is operated, and the fourth synchro device 40d is engaged with the third gear train 30c;
- wherein a speed change to a seventh forward speed is realized as the first clutch C1 is operated, the second synchro device 40b is engaged with the first gear train 30a, and the fourth synchro device 40d is engaged with the third gear train 30c;
- and
- wherein a speed change to an eighth forward speed is realized as the second clutch C2 is operated, the first synchro device 40a is engaged with the first gear train 30a, and the second synchro device 40b is engaged with the second gear train 30b.
19 more elements
A DCT which provides eight forward speeds and one reverse speed, comprising:
- first and second input shafts 10a and 10b selectively receiving power from an engine E/G through a first clutch C1 and a second clutch C2, respectively;
- an output shaft 20 including first and second output shafts 20a and 20b which receive power from the first and second input shafts 10a and 10b, respectively, and output the received power;
- first and second gear trains 30a and 30b mounted on the first input shaft 10a and selectively transmitting power to the output shaft 20;
- third and fourth gear trains 30c and 30d mounted on the second input shaft 10b and selectively transmitting power to the output shaft 20;
- a first synchro device 40a installed on the first output shaft 20a so as to be positioned between the first and second gear trains 30a and 30b and synchronizing the first and second gear trains 30a and 30b to selectively transmit power, and a third synchro device 40c installed on the first output shaft 20a so as to be positioned between the third and fourth gear trains 30c and 30d and synchronizing the third and fourth gear trains 30c and 30d to selectively transmit power;
- a second synchro device 40b installed on the second output shaft 20b so as to be positioned between the first and second gear trains 30a and 30b and synchronizing the first and second gear trains 30a and 30b to selectively transmit power, and a fourth synchro device 40d installed on the second output shaft 20b so as to be positioned between the third and fourth gear trains 30c and 30d and synchronizing the third and fourth gear trains 30c and 30d to selectively transmit power;
- and
- an output gear 50 installed on the output shaft 20 and transmitting an output thereof to a differential device Diff,
- wherein the fourth gear train 30d comprises a fifth gear train 30e so as to operate as dual gear trains,
- wherein the first and second input shafts 10a and 10b are provided in the form of dual pipes using hollow shafts and arranged on a coaxial line,
- wherein the first to fourth gear trains 30a to 30d comprise external gears,
- wherein a speed change to a reverse speed is realized as the second clutch C2 is operated, and the third synchro device 40c is engaged with the fourth gear train 30d;
- wherein a speed change to a neutral speed is realized as the second synchro device 40b is engaged selectively with the second gear train 30b, and the fourth synchro device 40d is engaged with the fourth gear train 30d;
- wherein a speed change to a first forward speed is realized as the first clutch C1 is operated, the second synchro device 40b is engaged with the second gear train 30b, and the fourth synchro device 40d is engaged with the fourth gear train 30d;
- wherein a speed change to a second forward speed is realized as the second clutch C2 is operated, and the fourth synchro device 40d is engaged with the fourth gear train 30d;
- wherein a speed change to a third forward speed is realized as the first clutch C1 is operated, and the first synchro device 40a is engaged with the second gear train 30b;
- wherein a speed change to a fourth forward speed is realized as the second clutch C2 is operated, and the third synchro device 40c is engaged with the third gear train 30c;
- wherein a speed change to a fifth forward speed is realized as the first clutch C1 is operated, and the first synchro device 40a is engaged with the first gear train 30a;
- wherein a speed change to a sixth forward speed is realized as the second clutch C2 is operated, and the fourth synchro device 40d is engaged with the third gear train 30c;
- wherein a speed change to a seventh forward speed is realized as the first clutch C1 is operated, the second synchro device 40b is engaged with the first gear train 30a, and the fourth synchro device 40d is engaged with the third gear train 30c;
- and
- wherein a speed change to a eighth forward speed is realized as the second clutch C2 is operated, the first synchro device 40a is engaged with the first gear train 30a, and the second synchro device 40b is engaged with the second gear train 30b.
19 more elements
Dependencies are inferred from the claim text.