Power transmission

Claim 2

A power transmission comprising rotatable input and output means operatively connected by first and second drivingly connected gear units conditionable to provide a plurality of forward drive ratios and a plurality of reverse drive ratios, said first gear unit being solely provided by first and second operatively connected planetary gearsets forming a compound unit with first and second power paths, each of said gearsets having a sun gear and a ring gear operatively connected by planet gear means and a carrier for said planet gear means, drum means operatively connected to said input means for continuous rotation thereby, gear means fixed to the outer periphery of said drum means providing a power takeoff, a first selectively engageable clutch engageable to drivingly connect said input means to said ring gear of said first gearset, first selectively engageable brake means operatively connected to said second gearset engageable to condition said front gear unit for a forward drive reduction ratio with power flowing through first and second paths provided by said first gear unit into said second gear unit, a second selectively engageable brake means operatively connected to said first gearset to condition said front gear unit for another forward drive reduction ratio with power flowing only through said first path of said first gear unit into said second gear unit, and a second selectively engageable clutch engageable completely housed within said drum means to drivingly connect said sun gear of said second gearset to said input to provide for a reverse drive speed reduction ratio when only said first brake means is additionally engaged, said second gear unit having third and fourth operatively connected planetary gearsets, third selectively engageable brake means to condition said second planetary gear unit for a first reduction drive of said output means by the compound action of said third and fourth gearsets, fourth selectively engageable brake means to condition said fourth planetary gearset for a second reduction drive of said output means, and single clutch means selectively engageable for locking said second gear unit for direct drive operation.

Claim 3

The power transmission of claim wherein said single clutch means is a third selectively engageable clutch for drivingly connecting one of said ring gears with one of said sun gears of said second gear unit for locking said third and fourth planetary gearsets for a direct drive, said third planetary gearset having a carrier drivingly connected to the ring gear of said fourth planetary gearset, said third planetary gearset further having a sun gear drivingly connected to said carrier of said fourth planetary gearset and to said output means.

Claim 4

The power transmission of claim 1, wherein said single clutch means is a selectively engageable clutch for drivingly connecting one oF said ring gears with one of said sun gears of said second gear unit for locking said third planetary gearset for a direct drive, said third planetary gearset having a ring gear drivingly connected to the carrier of said fourth planetary gearset and having a carrier drivingly connected to the sun gear of said fourth planetary gearset and to said output means.

Claim 5

A power transmission comprising rotatable input and output means operatively connected by front and rear drivingly connected gear units conditionable to provide a plurality of forward drive ratios and a plurality of reverse drive ratios, said front gear unit being provided by first and second operatively connected planetary gearsets each having a sun gear and a ring gear operatively connected by planet gear means and having a carrier for said planet gear means, a first selectively engageable clutch engageable to drivingly connect said input to said ring gear of said first gearset, first selectively engageable brake means operatively connected to said carrier of second gearset engageable to condition said front gear unit for a forward drive reduction ratio with power flowing through first and second paths in said front gear unit into said rear gear unit, second selectively engageable brake means operatively connected to said sun gear of said first gearset to condition said front gear unit for another forward drive reduction ratio with power flowing only through said first path in said front gear unit into said rear gear unit, a drum operatively connected to said input for rotation therewith, power takeoff gear means formed on said drum means, a second selectively engageable clutch disposed within said drum and engageable to drivingly connect said sun gear of said second gearset to said input to provide for a reverse drive speed reduction ratio when only said first brake means is additionally engaged, said rear gear unit having third and fourth operatively connected planetary gearsets, each of said last-mentioned gearsets having a sun gear and a ring gear connected by planet gear means and having a carrier for said planet gear means, said carrier of said fourth gearset being directly connected to said sun gear of said third gearset and to said transmission output means, said carrier of said third planetary gearset being directly connected to said ring gear of said fourth gearset, third selectively engageable brake means operatively connected to said ring gear of said third gearset to condition said third and fourth planetary gearsets for cooperative drive of said transmission output means, fourth selectively engageable brake means operatively connected to said ring gear of said fourth planetary gearset to condition said fourth planetary gearset for the drive of said transmission output means, and single clutch means operatively connected to one of said sun gears and one of said ring gears of said third and fourth gearsets and engageable to lock said third and fourth gearsets for rotation as a unit for the direct drive of said transmission output means.

Claim 6

A power transmission comprising rotatable input and output means operatively connected by front and rear drivingly connected gear units conditionable to provide a plurality of forward drive ratios and a plurality of reverse drive ratios, said front gear unit being provided by first and second operatively connected planetary gearsets each having a sun gear and a ring gear operatively connected by planet gear means and having a carrier for said planet gear means, a first selectively engageable clutch engageable to drivingly connect said input to said ring gear of said first gearset, first selectively engageable brake means operatively connected to said carrier of second gearset engageable to condition said front gear unit for a forward drive reduction ratio with power flowing through first and second paths in said front gear unit into said rear gear unit, second selectively engageable brake means operatively connected to said sun gear of said first gearset to condition said front gear unit for another forward drive reduction ratio with power flowing only through said first path in said front gear unit into said rear gear unit, a drum operatively connected to said input for rotation therewith, power takeoff gear means formed on said drum means, a second selectively engageable clutch disposed within said drum and engageable to drivingly connect said sun gear of said second gearset to said input to provide for a reverse drive speed reduction ratio when only said first brake means is additionally engaged, said rear gear unit having third and fourth operatively connected planetary gearsets, each of said last-mentioned gearsets having a sun gear and a ring gear connected by planet gear means and having a carrier for said planet gear means, said carrier of said fourth gearset being directly connected to said sun gear of said third gearset and to said transmission output means, said carrier of said third planetary gearset being directly connected to said ring gear of said fourth gearset, third selectively engageable brake means operatively connected to said ring gear of said third gearset to condition said third and fourth planetary gearsets for cooperative drive of said transmission output means, fourth selectively engageable brake means operatively connected to said ring gear of said fourth planetary gearset to condition said fourth planetary gearset for the drive of said transmission output means, and single clutch means operatively connected to one of said sun gears and one of said ring gears of said third and fourth gearsets and engageable to lock said third and fourth gearsets for rotation as a unit for the direct drive of said transmission output means.