Twin-clutch-type-transmission

• US 5,720,203 A
• Filed: 07/24/1996
• Issued: 02/24/1998
• Est. Priority Date: 07/25/1995
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Honda, Atsushi, Kinoshita, Masafumi, Nakada, Hirofumi, Kuramochi, Kojiro
• Primary Examiner(s): TA, KHOI QUANG
• Application Number:
  US08/686,064
• Time in Patent Office: 580 Days
• Field of Search: 74/325, 74/329, 74/330, 74/331
• US Class Current: 74/325
• CPC Class Codes: F16H 2003/0938 with multiple gears on the input shaft directly meshing with respective gears on the output shaft
• CPC Class Codes: F16H 2200/0047 the gear ratios comprising five forward speeds
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 3/093 with two or more countershafts
• CPC Class Codes: F16H 3/10 with one or more one-way clutches as an essential feature
• CPC Class Codes: Y10T 74/19219 Interchangeably locked
• CPC Class Codes: Y10T 74/19223 Disconnectable counter shaft
• CPC Class Codes: Y10T 74/19233 Plurality of counter shafts

Abstract

A twin-clutch-type transmission, which has a general input shaft, a first clutch connected with a first clutch output shaft, a second clutch connected with a second clutch output shaft, a sub shaft, and a general output shaft disposed parallel to the first clutch output shaft and the second clutch output shaft, is improved to effectively use the space around the sub shaft. A first gear connected to the first clutch output shaft and a second gear connected to the sub shaft associatingly interlock the sub shaft and the first clutch output shaft while being meshed to each other. A fifth gear and a sixth gear disposed on the general output shaft are respectively meshed with the third gear and the fourth gear which are connected to the second clutch output shaft and selectively connected to the general output shaft with a first synchronizing device disposed on the general output shaft, and interlock the second clutch output shaft and the general output shaft in association with the third gear and the fourth gear. A seventh gear meshed with the fifth gear and a eighth gear meshed with the fourth gear disposed on the sub shaft interlock the sub shaft and the general output shaft by selectively connecting the seventh gear and the eighth gear themselves to the sub shaft by the second synchronizing device so as to complete the first forward speed gearing in addition to completing the reverse gearing.

Claims

1. A twin-clutch-type transmission comprising a general input shaft, a first clutch, a second clutch, a first clutch output shaft connected to said first clutch, a second clutch output shaft connected to said second clutch, a sub shaft disposed parallel to said first clutch output shaft and said second clutch output shaft, and a general output shaft disposed parallel to said first clutch output shaft and said second clutch output shaft;

a first gear connected to said first clutch output shaft;

a second gear connected to said sub shaft and meshed with said first gear, said second gear interlocking said sub shaft and said first clutch output shaft in association with said first gear,

a first synchronizing device disposed on said general output shaft;

a third gear and a fourth gear connected to said second clutch output shaft;

a fifth gear and a sixth gear disposed on said general output shaft, and respectively meshed with said third gear and said fourth gear, and selectively connected to said general output shaft with said first synchronizing device, said fifth gear and said sixth gear interlocking said second clutch output shaft and said general output shaft in association with said third gear and said fourth gear;

a second synchronizing device disposed on said sub shaft;

a seventh gear disposed on said sub shaft and meshed with said fifth gear for reverse gearing; and

a eighth gear disposed on said sub shaft and meshed with said fourth gear for the first forward speed gearing,

said seventh gear and said eighth gear interlocking said sub shaft and said general output shaft by selectively connecting said seventh gear and said eighth gear themselves to said sub shaft through said second synchronizing device so as to complete the first forward speed gearing in addition to completing the reverse gearing.

2. A twin-clutch-type transmission according to claim 1, wherein said seventh gear is meshed with said fifth gear through said third gear and an idly rotating ninth gear.

3. A twin-clutch-type transmission according to claim 1 or 2, wherein an additional gear and an additional synchronizing device for connecting said additional gear to said first clutch output shaft are disposed on said first clutch output shaft, and a gear meshed with said additional gear is disposed on said general output shaft for another forward speed gearing.

4. A twin-clutch-type transmission according to claim 1 or 2, wherein two additional gears and an additional synchronizing device for connecting said additional gear to said first clutch output shaft are disposed on said first clutch output shaft, and two gears meshed with said additional gears are disposed on said general output shaft for two other forward speed gearings.

5. A twin-clutch-type transmission according to claim 1 or 2, wherein a gear meshed with said first gear and a synchronizing device for selectively connecting said gear to said general output shaft is disposed on said general output shaft.

6. A twin-clutch-type transmission according to claim 5, wherein an additional gear is disposed on said general output shaft and said additional gear is selectively connected to general output shaft by said synchronizing device disposed on said general output shaft.

7. A twin-clutch-type transmission according to one of claims 1 or 2, wherein the third gear and the fifth gear are used for completing the second forward speed gearing, and a one-way clutch exclusively transmitting power from the sub shaft to the second clutch output shaft is disposed in a power transmitting route between said second synchronizing device and said eighth gear.