Abstract: A multiple-ratio automatic transmission having plural torque delivery paths that are established and disestablished by a roller clutch and brake system. The clutch and brake system establishes and disestablishes torque flow paths while preventing simultaneous clutch or brake engagement. The clutch and brake system is capable of accommodating instantaneous torque reversals during ratio changes. Simplified clutch and brake system actuators trigger the application and release of the clutches and brakes during ratio changes.

Abstract: A drive speed control system having an input shaft and an output shaft in communication with a planetary gear mechanism. The planetary gear mechanism is in communication with a first rotatable drum member and a second rotatable drum member which is positioned radially inward relative to the first rotatable drum member. A first annular inflatable member is positioned radially outwardly of the first rotatable drum member and a second annular inflatable member is positioned radially between the first and second rotatable drum members. The first and second annular inflatable members are in communication with a control system to cause the inflation of the first annular inflatable member to inhibit rotation of the first rotatable drum member and to cause inflation of the second annular inflatable member, when the first annular inflatable member is uninflated, to cause the first rotatable drum member to rotate in unison with the second rotatable drum.