NINE SPEED AUTOMATIC TRANSMISSION

• US 20090036252A1
• Filed: 04/18/2008
• Published: 02/05/2009
• Est. Priority Date: 07/31/2007
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations Incorporated (Motors Liquidation Co. GUC Trust)
• Inventors: Borgerson, James B., Phillips, Andrew W.
• Granted Patent: US 8,113,978 B2
• Time in Patent Office: Days
• US Class Current: 475/211
• CPC Class Codes: F16H 2200/0065 the gear ratios comprising nine forward speeds
• CPC Class Codes: F16H 2200/0091 the gear ratios comprising three reverse speeds
• CPC Class Codes: F16H 2200/2012 with four sets of orbital gears
• CPC Class Codes: F16H 2200/2053 with nine engaging means
• CPC Class Codes: F16H 3/666 with compound planetary gear units, e.g. two intermeshing orbital gears F16H3/663 takes precedence

Abstract

The present invention provides a nine forward speed automatic transmission for a motor vehicle which includes four planetary gear sets, a plurality of friction and synchronizer clutches and two chain drive assemblies. The transmission is arranged along two parallel axes of rotation: a first axis defined by the input shaft and a second axis defined by the output shaft. The chain drive assemblies transfer power between sprockets disposed on the two axes. Various combinations of clutches may be engaged to provide nine forward speed ratios and five reverse speed ratios.

Claims

1. A multiple speed automatic transmission comprising, in combination,

an input member,

an output member,

a first, a second, a third and a fourth planetary gear assembly each having a first, a second and a third member,

a first and a second chain drive assembly each having a pair of sprockets and a sprocket engaging chain,

a first connecting member for continuously connecting one of said members of said first planetary gear assembly with one of said pair of sprockets of said second chain drive assembly,

a second connecting member connected to another of said members of said first planetary gear assembly,

a third connecting member for continuously connecting said another of said members of said first planetary gear assembly with one of said pair of sprockets of said first chain drive assembly,

a fourth connecting member connected to one of said members of said second planetary gear assembly,

a fifth connecting member for continuously connecting another of said members of said second planetary gear assembly with one of said members of said third planetary gear assembly

a sixth connecting member for continuously connecting another of said pair of sprockets of said second chain drive assembly with yet another of said members of said second planetary gear assembly,

a seventh connecting member for continuously connecting another of said pair of sprockets of said first chain drive assembly with one of said members of said fourth planetary gear assembly,

an eighth connecting member for continuously connecting said one of said members of said second planetary gear assembly with another of said members of said third planetary gear assembly,

said output member continuously connected to yet another of said members of said third planetary gear assembly and another of said members of said fourth planetary gear assembly, and

a plurality of torque transmitting devices selectively connecting:

each of said members of said first planetary gear assembly to said input member and yet another of said members of said first planetary gear assembly to ground, said fifth connecting member to ground, said fourth connecting member to said sixth connecting member, said fourth connecting member to ground, said seventh connecting member to yet another of said members of said fourth planetary gear assembly and said yet another of said members of said fourth planetary gear assembly to ground.

2. The multiple speed automatic transmission of claim 1 wherein said torque transmitting devices selectively connecting each of said members of said first planetary gear assembly to said input member are friction clutches.

3. The multiple speed automatic transmission of claim 1 wherein said first, second and third members of said planetary gear assemblies are one of a sun gear, a planet gear carrier and a ring gear.

4. The multiple speed automatic transmission of claim 1 wherein said input member and said output member are shafts which define parallel, spaced-apart axes.

5. The multiple speed automatic transmission of claim 1 wherein said output member is a shaft configured to provide drive torque at both ends.

6. The multiple speed automatic transmission of claim 1 wherein said plurality of torque transmitting devices include friction clutches, synchronizer clutches and brakes.

7. The multiple speed automatic transmission of claim 1 wherein said chain drive assemblies are located opposite said input member.

8. A multiple speed automatic transmission comprising, in combination,

an input member,

an output member,

a first, a second, a third and a fourth planetary gear assembly each having a first, a second and a third member,

a first and a second chain drive assembly each having a pair of sprockets and a sprocket engaging chain,

a first connecting member for continuously connecting said first of said members of said first planetary gear assembly with one of said pair of sprockets of said second chain drive assembly,

a second connecting member connected to said second of said members of said first planetary gear assembly,

a third connecting member for continuously connecting said second of said members of said first planetary gear assembly with one of said pair of sprockets of said first chain drive assembly,

a fourth connecting member connected to said second of said members of said second planetary gear assembly,

a fifth connecting member for continuously connecting said third of said members of said second planetary gear assembly with said first of said members of said third planetary gear assembly

a sixth connecting member for continuously connecting another of said pair of sprockets of said second chain drive assembly with said first of said members of said second planetary gear assembly,

a seventh connecting member for continuously connecting another of said pair of sprockets of said first chain drive assembly with said first of said members of said fourth planetary gear assembly,

an eighth connecting member for continuously connecting said second of said members of said second planetary gear assembly with said second of said members of said third planetary gear assembly,

said output member continuously connected to said third of said members of said third planetary gear assembly and said second of said members of said fourth planetary gear assembly, and

a plurality of torque transmitting devices selectively connecting:

each of said members of said first planetary gear assembly to said input member and said third of said members of said first planetary gear assembly to ground, said fifth connecting member to ground, said fourth connecting member to said sixth connecting member, said fourth connecting member to ground, said seventh connecting member to said third of said members of said fourth planetary gear assembly and said third of said members of said fourth planetary gear assembly to ground.

9. The multiple speed automatic transmission of claim 8 wherein said first members of said planetary gear assemblies are sun gears, said second members of said planetary gear assemblies are planet carriers and said third members of said planetary gear assemblies are ring gears.

10. The multiple speed automatic transmission of claim 8 wherein said input member and said output member are shafts which define parallel, spaced-apart axes.

11. The multiple speed automatic transmission of claim 8 wherein said output member is a shaft configured to provide drive torque at both ends.

12. The multiple speed automatic transmission of claim 8 wherein said plurality of torque transmitting devices include friction clutches, synchronizer clutches and brakes.

13. The multiple speed automatic transmission of claim 8 wherein said chain drive assemblies are disposed between pairs of said planetary gear assemblies.

14. A multiple speed automatic transmission comprising, in combination,

an input member,

an output member,

a first, a second, a third and a fourth planetary gear assembly each having a sun member, a carrier member and a ring member,

a first and a second chain drive assembly each having a pair of sprockets and a sprocket engaging chain,

a first connecting member for continuously connecting said sun member of said first planetary gear assembly with one of said pair of sprockets of said second chain drive assembly,

a second connecting member connected to said carrier member of said first planetary gear assembly,

a third connecting member for continuously connecting said carrier member of said first planetary gear assembly with one of said pair of sprockets of said first chain drive assembly,

a fourth connecting member connected to said carrier member of said second planetary gear assembly,

a fifth connecting member for continuously connecting said ring member of said second planetary gear assembly with said sun member of said third planetary gear assembly

a sixth connecting member for continuously connecting another of said pair of sprockets of said second chain drive assembly with said sun member of said second planetary gear assembly,

a seventh connecting member for continuously connecting another of said pair of sprockets of said first chain drive assembly with said sun member of said fourth planetary gear assembly,

an eighth connecting member for continuously connecting said ring member of said second planetary gear assembly with said ring member of said third planetary gear assembly,

said output member continuously connected to said ring member of said third planetary gear assembly and said carrier member of said fourth planetary gear assembly, and

a plurality of torque transmitting devices selectively connecting:

each of said members of said first planetary gear assembly to said input member and said ring member of said first planetary gear assembly to ground, said fifth connecting member to ground, said fourth connecting member to said sixth connecting member, said fourth connecting member to ground, said seventh connecting member to said ring member of said fourth planetary gear assembly and said ring member of said fourth planetary gear assembly to ground.

15. The multiple speed automatic transmission of claim 14 wherein said chain drive assemblies are disposed parallel to one another.

16. The multiple speed automatic transmission of claim 14 wherein said torque transmitting devices selectively connecting each of said members of said first planetary gear assembly to said input shaft are friction clutches.

17. The multiple speed automatic transmission of claim 14 wherein said torque transmitting devices connecting said ring member of said first planetary gear assembly to ground, said fifth connecting member to ground, said fourth connecting member to ground and said ring member of said fourth planetary gear assembly to ground are brakes.

18. The multiple speed automatic transmission of claim 14 wherein said input member and said output member are shafts which define parallel, spaced-apart axes.

19. The multiple speed automatic transmission of claim 14 wherein said output member is a shaft disposed to provide drive torque at both ends.