Automatic transmission for vehicle

A vehicle automatic transmission comprising:

• a plurality of rotating elements disposed rotatably relative to a transmission case;
• and a plurality of clutches each disposed between two rotating elements of the plurality of the rotating elements to be engaged to inhibit relative rotation between the two rotating elements and released to allow relative rotation between the two rotating elements,
• the plurality of the clutches not including those engaged to directly couple the rotating elements to the transmission case and selectively establishing all multiple shift stages achieved in the automatic transmission depending on a combination of engagement and release of the plurality of the clutches, the vehicle automatic transmission, comprising:
• a first planetary gear device, a second planetary gear device, and a third planetary gear device that are all of a single pinion type,
• a first clutch selectively coupling an input rotating element to the carrier of the second planetary gear device,
• a second clutch selectively coupling the ring gear of the first planetary gear device to the sun gear of the second planetary gear device and the carrier of the third planetary gear device coupled to each other,
• a third clutch selectively coupling the carrier of the first planetary gear device to the carrier of the second planetary gear device,
• a fourth clutch selectively coupling the ring gear of the first planetary gear device to the ring gear of the third planetary gear device,
• a fifth clutch selectively coupling the carrier of the first planetary gear device to the ring gear of the third planetary gear device,
• a sixth clutch selectively coupling the input rotating element to the sun gear of the third planetary gear device, and
• an output rotation element coupled to the ring gear of the second planetary gear device, and
• the sun gear of the first planetary gear device being coupled to the transmission case, and
• each of the multiple shift stages being established by engaging four clutches of the six clutches and releasing the remaining two clutches.

A vehicle automatic transmission comprising:

• a plurality of rotating elements disposed rotatably relative to a transmission case;
• and a plurality of clutches each disposed between two rotating elements of the plurality of the rotating elements to be engaged to inhibit relative rotation between the two rotating elements and released to allow relative rotation between the two rotating elements,
• the plurality of the clutches not including those engaged to directly couple the rotating elements to the transmission case and selectively establishing all multiple shift stages achieved in the automatic transmission depending on a combination of engagement and release of the plurality of the clutches, the vehicle automatic transmission, comprising:
• a first planetary gear device of a single pinion type, a second planetary gear device of the single pinion type, and a third planetary gear device of a double pinion type,
• a first clutch selectively coupling an input rotating element to the carrier of the first planetary gear device,
• a second clutch selectively coupling the carrier of the first planetary gear device to the ring gear of the third planetary gear device,
• a third clutch selectively coupling the ring gear of the second planetary gear device to the ring gear of the third planetary gear device,
• a fourth clutch selectively coupling the ring gear of the second planetary gear device to the sun gear of the third planetary gear device,
• a fifth clutch selectively coupling the sun gear of the first planetary gear device and the carrier of the second planetary gear device coupled to each other to the sun gear of the third planetary gear device,
• a sixth clutch selectively coupling the input rotating element to the sun gear of the second planetary gear device, and
• an output rotating element coupled to the ring gear of the first planetary gear device, and wherein
• the carrier of the third planetary gear device is coupled to the transmission case, and
• each of the multiple shift stages being established by engaging four clutches of the six clutches and releasing the remaining two clutches.

A vehicle automatic transmission comprising:

• a plurality of rotating elements disposed rotatably relative to a transmission case;
• and a plurality of clutches each disposed between two rotating elements of the plurality of the rotating elements to be engaged to inhibit relative rotation between the two rotating elements and released to allow relative rotation between the two rotating elements,
• the plurality of the clutches not including those engaged to directly couple the rotating elements to the transmission case and selectively establishing all multiple shift stages achieved in the automatic transmission depending on a combination of engagement and release of the plurality of the clutches, the vehicle automatic transmission, comprising:
• a first planetary gear device of a single pinion type, a second planetary gear device of the single pinion type, and a third planetary gear device of a double pinion type,
• a first clutch selectively coupling an input rotating element to the carrier of the first planetary gear device,
• a second clutch selectively coupling the carrier of the first planetary gear device to the carrier of the second planetary gear device,
• a third clutch selectively coupling the sun gear of the first planetary gear device and the ring gear of the third planetary gear device coupled to each other to the ring gear of the second planetary gear device,
• a fourth clutch selectively coupling the ring gear of the second planetary gear device to the sun gear of the third planetary gear device,
• a fifth clutch selectively coupling the carrier of the second planetary gear device to the sun gear of the third planetary gear device,
• a sixth clutch selectively coupling the input rotating element to the carrier of the third planetary gear device, and
• an output rotating element coupled to the ring gear of the first planetary gear device, and wherein
• the sun gear of the second planetary gear device is coupled to the transmission case, and
• each of the multiple shift stages being established by engaging four clutches of the six clutches and releasing the remaining two clutches.

A vehicle automatic transmission comprising:

• a plurality of rotating elements disposed rotatably relative to a transmission case;
• and a plurality of clutches each disposed between two rotating elements of the plurality of the rotating elements to be engaged to inhibit relative rotation between the two rotating elements and released to allow relative rotation between the two rotating elements,
• the plurality of the clutches not including those engaged to directly couple the rotating elements to the transmission case and selectively establishing all multiple shift stages achieved in the automatic transmission depending on a combination of engagement and release of the plurality of the clutches, the vehicle automatic transmission, comprising
• a first planetary gear device of a double pinion type and a second planetary gear device of a single pinion type,
• a first clutch selectively coupling an input rotating element to a carrier of the first planetary gear device,
• a second clutch selectively coupling the input rotating element to a sun gear of the first planetary gear device and a sun gear of the second planetary gear device coupled to each other,
• a third clutch selectively coupling the carrier of the first planetary gear device to a ring gear of the second planetary gear device,
• a fourth clutch selectively coupling the sun gear of the first planetary gear device and the sun gear of the second planetary gear device coupled to each other to the ring gear of the second planetary gear device, and
• an output rotating element coupled to a ring gear of the first planetary gear device, and
• a carrier of the second planetary gear device being coupled to the transmission case.