Automatic transmission apparatus

• US 4,697,471 A
• Filed: 01/22/1986
• Issued: 10/06/1987
• Est. Priority Date: 01/30/1985
• Status: Expired due to Fees

• Current Assignee: Mazda Motor Corporation
• Original Assignee: Mazda Motor Corporation
• Inventors: Hiketa, Manabu
• Primary Examiner(s): Braun, Leslie
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/821,288
• Time in Patent Office: 622 Days
• Field of Search: 74/364, 74/360, 74/325, 74/330, 74/331, 74/359, 74/340
• US Class Current: 74/359
• CPC Class Codes: F16H 3/10 with one or more one-way clutches as an essential feature
• CPC Class Codes: Y10T 74/19228 Multiple concentric clutch shafts
• CPC Class Codes: Y10T 74/194 Selective

Abstract

An automatic transmission apparatus comprises an input shaft coupled with an engine output shaft, an output shaft disposed coaxially with the input shaft, a counter shaft disposed in parallel to both the input and output shafts, first and second gears provided on the input shaft and the counter shaft, respectively, to be meshed with each other so as to form a first power transmitting path, a first friction clutch operative selectively to make and break the first power transmitting path, third and fourth gears provided on the input shaft through a one-way clutch and on the counter shaft, respectively, to be meshed with each other so as to form a second power transmitting path, a second friction clutch operative selectively to make and break a third power transmitting path from the input shaft through the one-way clutch to the output shaft, fifth and sixth gears provided on the counter shaft and the output shaft, respectively, to be meshed with each other so as to form a fourth power transmitting path, and a third friction clutch operative selectively to make and break the fourth power transmitting path.

Claims

1. An automatic transmission apparatus comprising:

an input shaft,

an output shaft disposed behind and coaxially with said input shaft,

a counter shaft disposed substantially parallel to both of said input and output shafts,

a first gear train including a first gear provided on said input shaft and a second gear provided on said counter shaft to be meshed with said first gear so as to form a first power transmitting path,

first friction clutch means operative selectively to make and break the first power transmitting path,

a second gear train including a third gear provided through one-way clutch means on a rear end portion of said input shaft and a fourth gear provided on said counter shaft to be meshed with said third gear so as to form a second power transmitting path,

second friction clutch means provided at a front end portion of said output shaft and operative selectively to make and break a third power transmitting path from said input shaft through said one-way clutch means to said output shaft,

a third gear train including a fifth gear provided on a rear end portion of said counter shaft and a sixth gear provided on said output shaft to be meshed with said fifth gear so as to form a fourth power transmitting path, and

third friction clutch means operative selectively to make and break said fourth power transmitting path;

said third friction clutch being provided coaxially with the output shaft at the output side of the sixth gear for making the fourth power transmitting means to be used for lower speed ranges and arranged to have a diameter larger than that of each of the first and second friction clutch means.

2. An automatic transmission apparatus according to claim 1 further comprising fourth friction clutch means operative selectively to make and break the second power transmitting path.

3. An automatic transmission apparatus according to claim 2 further comprising additional one-way clutch means provided between said output shaft and said sixth gear.

4. An automatic transmission apparatus according to claim 3 further comprising at least one additional friction clutch means provided in a substantially parallel relation to one of said one-way clutch means and said additional one-way clutch means to be used for engine-braking.

5. An automatic transmission apparatus according to claim 2, wherein each of said first, second, third and fourth friction clutch means comprises a wet multi-plate clutch device.

6. An automatic transmission apparatus according to claim 5 further comprising a dry friction clutch device for coupling said input shaft with an output shaft of an engine.

7. An automatic transmission apparatus according to claim 2 further comprising a fourth gear train including a seventh gear provided on said counter shaft and a eighth gear provided on said output shaft to be meshed with said seventh gear so as to form a fifth power transmitting path, and fifth friction clutch means operative selectively to make and break the fifth power transmitting path.

8. An automatic transmission apparatus according to claim 7 further comprising additional one-way clutch means provided between said output shaft and said sixth gear.

9. An automatic transmission apparatus according to claim 8 further comprising at least one additional friction clutch means provided in a substantially parallel relation to one of said one-way clutch means and said additional one-way clutch means to be used for engine-braking.

10. An automatic transmission apparatus according to claim 7, wherein each of said first, second, third, fourth and fifth friction clutch means comprises a wet multi-plate clutch device.

11. An automatic transmission apparatus according to claim 10 further comprising a dry friction clutch device for coupling said input shaft with an output shaft of an engine.

12. An automatic transmission apparatus according to claim 1 further comprising a reverse gear train which includes a driving gear provided on said counter shaft, an idle gear provided on an idle shaft to be meshed with said driving gear and a follower gear provided on said output shaft to be meshed with said idle gear so as to form an additional power transmitting path for a reverse speed range, and coupling means for making the additional power transmitting path effective and ineffective selectively.

13. An automatic transmission apparatus according to claim 1 further comprising additional friction clutch means for coupling said input shaft with an output shaft of an engine, said additional friction clutch means comprising a dry friction clutch device.

14. An automatic transmission apparatus comprising:

an input shaft,

an output shaft disposed behind and coaxially with said input shaft,

a counter shaft disposed substantially parallel to both of said input and output shafts,

a first gear train including a first gear provided on said input shaft and a second gear provided on said counter shaft to be meshed with said first gear so as to form a first power transmitting path,

first friction clutch means operative selectively to make and break the first power transmitting path,

a second gear train including a third gear provided through one-way clutch means on a rear end portion of said input shaft and fourth gear provided on said counter shaft to be meshed with said third gear so as to form a second power transmitting path,

second friction clutch means provided at a front end portion of said output shaft and operative selectively to make and break a third power trannsmitting path from said input shaft through said one-way clutch means to said output shaft,

a third gear train including a fifth gear provided on a rear end portion of said counter shaft and a sixth gear provided on said output shaft to be meshed with said fifth gear so as to form a fourth power transmitting path,

third friction clutch means operative selectively to make and break said fourth power transmitting path, and

fourth friction clutch means operative selectively to make and break the second power transmitting path, wherein said second and fourth power transmitting paths are made for a first speed range, said first and fourth power transmitting paths are made for a second speed range, said third power transmitting path is made for a third speed range, and said first and second power transmitting paths and a supplemental power transmitting path from said second gear train through said second friction clutch means to said output shaft are made for a fourth speed range.

15. An automatic transmission apparatus comprising:

an input shaft,

an output shaft disposed behind and coaxially with said input shaft,

a counter shaft disposed substantially parallel to both of said input and output shafts,

a first gear train including a first gear provided on said input shaft and a second gear provided on said counter shaft to be meshed with sid first gear so as to form a first power transmitting path,

first friction clutch means operative selectively to make and break the first power transmitting path,

a second gear train including a third gear provided through one-way clutch means on a rear end portion of said input shaft and a fourth gear provided on said counter shaft to be meshed with said third gear so as to form a second power transmitting path,

second friction clutch means provided at a front end portion of said output shaft and operative selectively to make and break a third power transmitting path from said input shaft through said one-way clutch means to said output shaft,

a third gear train including a fifth gear provided on a rear end portion of said counter shaft and a sixth gear provided on said output shaft to be meshed with said fifth gear so as to form a fourth power transmitting path,

third friction clutch means operative selectively to make and break said fourth power transmitting path,

fourth friction clutch means operative selectively to make and break the second power transmitting path,

a fourth gear train including a seventh gear provided on said counter shaft and an eighth gear provided on said output shaft to be meshed with said seventh gear so as to form a fifth power transmitting path, and

fifth friction clutch means operative selectively to make and break the fifth power transmitting path, wherein said second and fourth power transmitting paths are made for a first speed range, said first and fourth power transmitting paths are made for a second speed range, said second and fifth power transmitting paths are made for a third speed range, said first and fifth power transmitting paths are made for a fourth speed range, said third power transmitting path is made for a fifth speed range, and said first and second power transmitting paths and a supplemental power transmitting path from said second gear train through said second friction clutch means to said output shaft are made for a sixth speed range.