AUTOMATIC TRANSMISSION FOR VEHICLES

摘要

An automatic transmission for a vehicle includes: the input shaft being constantly connected to the second element, arranged to be connected to the second sun gear by an engagement of the first clutch, and arranged to be engaged with the third sun gear by an engagement of the second clutch, the output member being constantly connected to the second ring gear, the first element being arranged to be fixed to the stationary portion by an engagement of the first brake, the third element being constantly connected to the second pinion carrier, and arranged to fixed to the stationary portion by an engagement of the second brake, and the third sun gear being arrange to be fixed to the stationary portion by an engagement of the third brake.

主权项

1. An automatic transmission for a vehicle comprising:
an input shaft; an output member; a stationary portion; a first planetary gear set including three rotation elements of a first sun gear, a first ring gear, and a first pinion carrier; a second planetary gear set which is a Ravigneaux type, and which includes a second sun gear, a third sun gear, a second pinion engaged with the second sun gear, a third pinion engaged with the second pinion and the third sun gear, a second pinion carrier which rotatably supports the second pinion and the third pinion, and a second ring gear engaged with the third pinion; and five frictional engagement elements of a first clutch, a second clutch, a first brake, a second brake, and a third brake, when the three rotational elements of the first planetary gear set are arranged on a common velocity diagram in dependence on distances corresponding to a teeth number ratio of the first planetary gear set, the three rotational elements of the first planetary gear set being defined as a first element, a second element, and a third element in order of arrangement on the common velocity diagram, the input shaft being constantly connected to the second element, arranged to be connected to the second sun gear by an engagement of the first clutch, and arranged to be engaged with the third sun gear by an engagement of the second clutch, the output member being constantly connected to the second ring gear, the first element being arranged to be fixed to the stationary portion by an engagement of the first brake, the third element being constantly connected to the second pinion carrier, and arranged to fixed to the stationary portion by an engagement of the second brake, and the third sun gear being arrange to be fixed to the stationary portion by an engagement of the third brake.