Multiple speed transmission having a band brake

• US 8,758,189 B2
• Filed: 01/26/2012
• Issued: 06/24/2014
• Est. Priority Date: 02/17/2011
• Status: Active Grant

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Hart, James M., Wilton, Daryl A.
• Primary Examiner(s): PANG, ROGER L
• Application Number:
  US13/359,083
• Publication Number:
  US 20120214636A1
• Time in Patent Office: 880 Days
• Field of Search: 475272-291, 475/296, 475/330
• US Class Current: 475/286
• CPC Class Codes: F16H 2200/0065 the gear ratios comprising nine forward speeds
• CPC Class Codes: F16H 2200/2012 with four sets of orbital gears
• CPC Class Codes: F16H 2200/2046 with six engaging means
• CPC Class Codes: F16H 3/666 with compound planetary gear units, e.g. two intermeshing orbital gears F16H3/663 takes precedence

Abstract

An automatic transmission includes an input shaft or member, an output shaft or member and three simple and one compound planetary gear assemblies each including a sun gear, a planet gear carrier with a plurality of planet gears and a ring gear. The input shaft or member is coupled to the sun gear of the second planetary gear assembly and the output shaft is coupled to the planet gear carrier of the fourth planetary gear assembly. The transmission also includes six torque transmitting devices: one band brake, three friction brakes and two friction clutches.

Claims

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

a first, a second, a third and a fourth planetary gear assembly, each of said planetary gear assemblies having three members,

an input member connected to one of said members of said second planetary gear assembly,

an output member connected to one of said members of said fourth planetary gear assembly,

one of said members of said first planetary gear assembly coupled to another of said members of said second planetary gear assembly,

another of said members of said first planetary gear assembly coupled to yet another of said members of said second planetary gear assembly,

a member for connecting said yet another of said members of said second planetary gear assembly with one of said members of said third planetary gear assembly,

another of said members of said third planetary gear assembly coupled to another of said members of said fourth planetary gear assembly,

yet another of said members of said third planetary gear assembly coupled to said one of said members of said fourth planetary gear assembly,

a band brake coupled to yet another of said members of said first planetary gear assembly, and

a plurality of torque transmitting devices selectively engageable to connect:

said one of said members of said first planetary gear assembly and said another of said members of said second planetary gear assembly to ground, said another of said members of said third planetary gear assembly and said another of said members of said fourth planetary gear assembly to ground, said input member to said another of said members of said third planetary gear assembly, said input member to said yet another of said members of said fourth planetary gear assembly, and said another of said members of said first planetary gear assembly and another of said members of said second planetary gear assembly to ground.

2. The multiple speed automatic transmission of claim 1 wherein each of said three members of said first, second, third and fourth planetary gear assemblies is one of a sun gear, a ring gear and a planet gear carrier.

3. The multiple speed automatic transmission of claim 1 wherein said one member of said first planetary gear assembly is a ring gear, said another member of said first planetary gear assembly is a planet gear carrier and said yet another member of said first planetary gear assembly is a sun gear.

4. The multiple speed automatic transmission of claim 1 wherein said second planetary gear assembly is a compound planetary gear assembly and one member of said second planetary gear assembly is a sun gear, said another member of said second planetary gear assembly is a ring gear and said yet another member of said second planetary gear assembly is a planet gear carrier.

5. The multiple speed automatic transmission of claim 1 wherein said one member of said third planetary gear assembly is a sun gear, said another member of said third planetary gear assembly is a planet gear carrier and said yet another member of said third planetary gear assembly is a ring gear.

6. The multiple speed automatic transmission of claim 1 wherein said one member of said fourth planetary gear assembly is a planet gear carrier, said another member of said fourth planetary gear assembly is a ring gear and said yet another member of said fourth planetary gear assembly is a sun gear.

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

a first, a second, a third and a fourth planetary gear assembly, each of said planetary gear assemblies having three members,

an input member connected to one of said members of said second planetary gear assembly,

an output member connected to one of said members of said fourth planetary gear assembly,

a first member for connecting one of said members of said first planetary gear assembly with another one of said members of said second planetary gear assembly,

a second member for connecting another of said members of said first planetary gear assembly with yet another of said members of said second planetary gear assembly,

a third member for connecting said yet another of said members of said second planetary gear assembly with one of said members of said third planetary gear assembly,

a fourth member for connecting another member of said third planetary gear assembly with another of said members of said fourth planetary gear assembly,

a fifth member for connecting yet another of said members of said third planetary gear assembly with said one of said members of said fourth planetary gear assembly,

a band brake,

a sixth member for connecting said band brake to yet another of said members of said first planetary gear assembly, and

a plurality of torque transmitting devices selectively engageable to connect:

said first connecting member to ground, said second connecting member to ground, said fourth connecting member to ground, said input member to said yet another of said members of said fourth planetary gear assembly and said input member to said another of said members of said third planetary gear assembly.

8. The multiple speed automatic transmission of claim 7 wherein a first group of said plurality of torque transmitting devices are brakes and a second group of said plurality of torque transmitting devices are clutches.

9. The multiple speed automatic transmission of claim 7 wherein each of said three members of said first, second, third and fourth planetary gear assemblies is one of a sun gear, a ring gear and a planet gear carrier.

10. The multiple speed automatic transmission of claim 7 wherein said one member of said first planetary gear assembly is a ring gear, said another member of said first planetary gear assembly is a planet gear carrier and said yet another member of said first planetary gear assembly is a sun gear.

11. The multiple speed automatic transmission of claim 7 wherein said one member of said second planetary gear assembly is a sun gear, said another member of said second planetary gear assembly is a ring gear and said yet another member of said second planetary gear assembly is a planet gear carrier.

12. The multiple speed automatic transmission of claim 7 wherein said one member of said third planetary gear assembly is a sun gear, said another member of said third planetary gear assembly is a planet gear carrier and said yet another member of said third planetary gear assembly is a ring gear.

13. The multiple speed automatic transmission of claim 7 wherein said one member of said fourth planetary gear assembly is a planet gear carrier, said another member of said fourth planetary gear assembly is a ring gear and said yet another member of said fourth planetary gear assembly is a sun gear.

14. The multiple speed automatic transmission of claim 7 wherein said second planetary gear assembly is a compound planetary gear assembly.

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

an input member,

an output member,

a first planetary gear assembly having a sun gear, a planet gear carrier rotatably supporting a plurality of planet gears and a ring gear,

a second planetary gear assembly having a sun gear coupled to and driven by said input member, a planet gear carrier coupled to said planet gear carrier of said first planetary gear assembly and rotatably supporting a plurality of planet gears and a ring gear coupled to said ring gear of said first planetary gear assembly,

a third planetary gear assembly having a sun gear coupled to said planetary gear carrier of said second planetary gear assembly, a planet gear carrier rotatably supporting a plurality of planet gears and a ring gear,

a fourth planetary gear assembly having a sun gear, a planet gear carrier coupled to and driving said output member, coupled to said ring gear of said third planetary gear assembly and rotatably supporting a plurality of planet gears and a ring gear coupled to said planet gear carrier of said third planetary gear assembly, and

a band brake disposed between said sun gear of said first planetary gear assembly and a housing, a first friction brake disposed between said ring gears of said first and said second planetary gear assemblies and said housing, a second friction brake disposed between said planet gear carrier of said first planetary gear assembly and said housing, and a third friction brake disposed between said planet gear carrier of said third planetary gear assembly and said ring gear of said fourth planetary gear assembly and said housing.

16. The multiple speed automatic transmission of claim 15 further including a first friction clutch disposed between said input member and said sun gear of said fourth planetary gear assembly and a second friction clutch disposed between said input member and said planet gear carrier of said third planetary gear assembly.

17. The multiple speed automatic transmission of claim 15 wherein said first, third and fourth planetary gear assemblies are simple planetary gear assemblies and said second planetary gear assembly is a compound planetary gear assembly.

18. The multiple speed automatic transmission of claim 15 further including a hydraulic actuator for engaging said band brake.