Power transmission for a vehicle
View Patent ↗A power transmission has three planetary gearsets, which are interconnected and also having at least one member continuously drivingly connected with an input shaft. Two of the planetary gearsets are connected with an output shaft. Five torque-transmitting mechanisms are disposed between two end walls and an outer housing, which define four spaces within the power transmission. The torque-transmitting mechanisms are disposed within two or more of the four spaces or combinations of two of the spaces.
1. A power transmission comprising:
an input shaft;
an output means;
a first planetary gearset, a second planetary gearset, and a third planetary gearset, a member of said first planetary gearset being continuously connected with a member of said third planetary gearset and with said output means;
another member of said first planetary gearset being connected with a member of said second planetary gearset;
another member of said second planetary gearset being continuously connected with said input shaft;
a further member of said second planetary gearset being connected with another member of said third planetary gearset;
a transmission housing including a first end wall, a second end wall, and an outer housing joining said first and second end walls, said housing and said planetary gearsets cooperating to define four spaces including a first space defined between said first end wall and said first planetary gearset, a second space defined between said second end wall and said third planetary gearset, a third space defined radially outward and circumferentially surrounding of said planetary gearsets and inward of said outer housing, a fourth space defined between said first and second planetary gearsets;
five selectively engageable torque-transmitting mechanisms operatively connected with said planetary gearsets including two torque-transmitting mechanisms being disposed in said first space and being operatively connected with members of said first planetary gearset, wherein:
said second and fourth torque transmitting mechanisms have apply pistons slidably disposed in said first end wall and radially stacked within the first space and having friction plates axially aligned within said first space, said fifth torque-transmitting mechanism being disposed radially inward of said friction plates of said second and fourth torque transmitting mechanisms, said third torque-transmitting mechanism being disposed in said fourth space, and said first torque-transmitting mechanism being disposed in said second space, or
first torque-transmitting mechanism being disposed in said third space, said second, third, fourth, and fifth torque transmitting mechanisms disposed in said first space having apply pistons radially stacked with the friction plates of said third, fourth, and fifth torque transmitting mechanisms being radially stacked in said first space, or
said first torque-transmitting mechanism being disposed in said second space, said second and fourth torque transmitting mechanisms being disposed in said first space with the apply pistons being slidably disposed in said first end wall, said third and fifth torque transmitting mechanisms being disposed in said fourth space with the apply pistons thereof being radially stacked and the friction plates thereof being radially stacked, or
first torque-transmitting mechanism being disposed in said second space, said second, third, fourth, and fifth torque transmitting mechanisms being disposed in said first space with the apply pistons and friction plates of said second and fourth torque transmitting mechanisms being axially stacked and with the apply pistons and friction plates of said third and fifth torque transmitting mechanisms being axially stacked radially inward of said second and fourth torque transmitting mechanisms, or
first torque-transmitting mechanism being disposed in said first space, said third torque-transmitting mechanism having the apply piston thereof disposed in said fourth space and having the friction plates thereof disposed radially outward of said second planetary gearset, said second, third, and fifth torque transmitting mechanisms being disposed in said first space with the apply pistons and the friction plates of said fourth and fifth torque transmitting mechanisms being axially stacked and with the second torque-transmitting mechanism being disposed radially outward of said fourth and fifth torque transmitting mechanisms, or
said first torque-transmitting mechanism having the apply piston thereof disposed in said second space, said second torque-transmitting mechanism being disposed in said third space, and said third, fourth, and fifth torque transmitting mechanisms being disposed in said first space with the friction plates thereof being radially stacked, and with the apply pistons of said third and fifth torque transmitting mechanisms being radially stacked in chambers formed in said first end wall, and with the apply pistons of said second and fourth torque transmitting mechanisms being axially stacked, and the apply pistons of said all of said torque transmitting mechanisms being non-rotatable, or
said first torque-transmitting mechanism having a non-rotatable apply piston and being disposed in said third space, said second, third, fourth, and fifth torque transmitting mechanisms having non-rotatable pistons with the friction plates of said third, fourth, and fifth torque transmitting mechanisms are radially stacked, the apply pistons of said second and fourth torque-transmitting mechanisms are radially stacked and the apply pistons of said third and fifth torque transmitting mechanisms are non-rotatable and axially stacked; and
said torque-transmitting mechanisms being engaged in combinations of two to establish six forward speed ratios and one reverse speed ratio.