Multi-stage transmission

A multi-stage transmission that changes speed of power transmitted from a motor of a vehicle to an input member to transmit the power to an output member, the multi-stage transmission comprising:

• a Ravigneaux type planetary gear mechanism including an input element to which power is transmitted from the input member, a fixable element, a first output element, and a second output element;
• a first planetary gear and a second planetary gear each including a plurality of rotating elements, wherein at least any one of the rotating elements of the first planetary gear and the second planetary gear is connected to the output member;
• a first brake that connects the fixable element of the Ravigneaux type planetary gear mechanism to a stationary member to hold the fixable element stationary and releases this connection;
• a first clutch that interconnects the first output element of the Ravigneaux type planetary gear mechanism with at least any one of the rotating elements of the first and the second planetary gears and releases this interconnection;
• a second clutch that interconnects the second output element of the Ravigneaux type planetary gear mechanism with at least any one of the rotating elements of the first and the second planetary gears and releases this interconnection, wherein
• when the fixable element is held stationary by the first brake, the Ravigneaux type planetary gear mechanism increases speed of power transmitted to the input element so that rotation speed of the second output element becomes higher than rotation speed of the first output element, and transmits the power to the first and the second output elements, and
• a second engagement oil chamber and a second centrifugal oil pressure cancel chamber of the second clutch are defined by a member that rotates integrally with the second output element;
• and
• third and fourth clutches and a second brake, wherein
• the plurality of rotating elements of the first planetary gear includes a first rotating element, a second rotating element, and a third rotating element that are aligned in order at intervals corresponding to a gear ratio on a speed diagram,
• the plurality of rotating elements of the second planetary gear includes a fourth rotating element, a fifth rotating element, and a sixth rotating element that are aligned in order at intervals corresponding to a gear ratio on a speed diagram,
• the input element of the Ravigneaux type planetary gear mechanism and the second rotating element of the first planetary gear are continuously coupled to the input member,
• the first rotating element of the first planetary gear and the fourth rotating element of the second planetary gear are continuously coupled together,
• the fifth rotating element of the second planetary gear and the output member are continuously coupled together,
• the first clutch interconnects the first output element of the Ravigneaux type planetary gear mechanism with the first rotating element of the first planetary gear and the fourth rotating element of the second planetary gear that are continuously coupled together and releases this interconnection,
• the second clutch interconnects the second output element of the Ravigneaux type planetary gear mechanism with the first rotating element of the first planetary gear and the fourth rotating element of the second planetary gear that are continuously coupled together and releases this interconnection,
• the third clutch interconnects the sixth rotating element of the second planetary gear with the first output element of the Ravigneaux type planetary gear mechanism and releases this interconnection,
• the fourth clutch interconnects the third rotating element of the first planetary gear with the fifth rotating element of the second planetary gear and the output member that are continuously coupled together and releases this interconnection, and
• the second brake connects the sixth rotating element of the second planetary gear to the stationary member to hold the sixth rotating element stationary and releases this connection.