Electro-mechanical automatic transmission having dual input shafts

• US 6,044,719 A
• Filed: 09/15/1998
• Issued: 04/04/2000
• Est. Priority Date: 09/15/1998
• Status: Expired due to Term

• Current Assignee: FCA US LLC (Stellantis NV)
• Original Assignee: Chrysler Corporation (Stellantis NV)
• Inventors: Carriere, Donald L., Reed, Richard G. Jr.
• Primary Examiner(s): Marmor, Charles A
• Assistant Examiner(s): HO, HA DINH
• Application Number:
  US09/153,165
• Time in Patent Office: 567 Days
• Field of Search: 74/331, 74/330, 74/329, 192/44
• US Class Current: 74/330
• CPC Class Codes: F16D 28/00 Electrically-actuated clutches arrangements for synchronisation F16D23/02; clutches actuated directly by means of an electromagnet F16D27/00; automatic clutches F16D43/00 - F16D45/00; external control F16D48/00
• CPC Class Codes: F16H 2200/0052 the gear ratios comprising six forward speeds
• CPC Class Codes: F16H 3/006 power being selectively transmitted by either one of the parallel flow paths
• CPC Class Codes: F16H 3/0915 with coaxial input and output shafts
• CPC Class Codes: F16H 57/043 within rotary parts, e.g. axial channels or radial openings in shafts
• CPC Class Codes: F16H 57/0493 Gearings with spur or bevel gears differentials with spur or bevel gears F16H57/0483
• CPC Class Codes: F16H 61/32 Electric motors actuators or related electrical control means therefor
• CPC Class Codes: F16H 61/688 with two inputs, e.g. selection of one of two torque-flow paths by clutches
• CPC Class Codes: F16H 63/18 the final actuating mechanism comprising cams
• CPC Class Codes: Y10T 74/19223 Disconnectable counter shaft
• CPC Class Codes: Y10T 74/19228 Multiple concentric clutch shafts

Abstract

An electro-mechanical automatic transmission is provided including a first input shaft and a second input shaft concentric with the first input shaft. A plurality of drive gears are rotatably mounted to each input shaft and are provided with synchronizer devices for selectively engaging the drive gears to the input shafts. A driver shaft is provided with a plurality of driven gears in meshing engagement with the drive gears. The electro-mechanical automatic transmission is provided with a pair of electro-mechanical clutch actuators for selectively disengaging dual clutches which transmit engine torque to the input shafts, as well as an electro-mechanical shift actuator system which operatively engage the synchronizer devices for selectively engaging the drive gears.

Claims

1. A transmission for use with a vehicle, comprising:

a housing;

first and second drive shafts, said first and second drive shafts supported within said housing, said second drive shaft being concentric with said first drive shaft;

a plurality of drive gears including a reverse gear and first through sixth speed gears, said first drive shaft including first, third, and fifth speed gears which are selectively engaged to said first drive shaft by a first pair of synchronizer devices disposed on said first drive shaft, and said second drive shaft including second, fourth and sixth speed gears which are selectively engaged to said second drive shaft by a second pair of synchronizer devices disposed on said second drive shaft; and

a driven shaft supported within said housing in parallel to said first and second drive shafts and including a plurality of driven gears fixedly mounted to said driven shaft in meshing engagement with corresponding ones of said drive gears mounted to said first and second drive shafts.

2. The transmission according to claim 1, wherein said reverse gear is provided on one of said first and second drive shafts and is selectively engaged by one of said synchronizer devices.

3. A transmission for use with a vehicle, comprising:

a housing;

a first drive shaft supported within said housing and having first, third and fifth speed gears rotatably mounted thereon and including first and second synchronizer devices for selective engagement of said reverse gear and said first, third and fifth speed gears with said first drive shaft;

a second drive shaft concentric with said first drive shaft and having second, fourth and sixth speed gears rotatably mounted thereon and including third and fourth synchronizer devices for selective engagement of said second, fourth and sixth speed gears with said second drive shaft;

a driven shaft supported within said housing in parallel to said first and second drive shafts and including a reverse driven gear and first through sixth speed driven gears fixedly mounted to said driven shaft in meshing engagement with corresponding ones of said first through sixth speed gears mounted to said first and second drive shafts.

4. The transmission according to claim 3, further comprising a first clutch device for engaging said first drive shaft with an engine and a second clutch device for engaging said second drive shaft with the engine, said first and second clutch devices each being disengaged by an electro-mechanical actuator device.

5. The transmission according to claim 3, wherein said first drive shaft includes a centrally located lubrication passage which delivers lubrication to each of said first through sixth speed gears on said first and second drive shafts.

6. The transmission according to claim 3, further comprising a hill holder device including an overrunning one-way clutch mechanism mounted on one of said first and second drive shafts and engagabie by said fourth synchronizer device.