Patent ID: 8313401

Claim:
A transmission system for a hybrid vehicle comprising: a first simple planetary gear set including a first sun gear, a first carrier and a first ring gear, wherein the first carrier is connected to an engine; a second simple planetary gear set that includes a second sun gear, a second carrier and a second ring gear, wherein the second sun gear is continuously connected to the first sun gear; a first torque transmission unit selectively connecting the first simple planetary gear set to the second simple planetary gear set; a second torque transmission unit configured to restrict rotation to a portion of the second simple planetary gear set; a first motor generator continuously connected to the first ring gear; a second motor generator continuously connected to the second sun gear; and a third torque transmission unit selectively directly connecting the first carrier with the engine, the first torque transmission unit and a third torque transmission unit are a first clutch and a second clutch, respectively, selectively connecting/disconnecting two members that rotate with respect to each other, and the second torque transmission unit is a first brake restricting rotation of members connected to the second simple planetary gear set, the first carrier is connected to the second ring gear through the first clutch and to the engine through the second clutch, the first ring gear is directly connected to the first motor generator, the second sun gear is directly connected to the second motor generator, and the second carrier is directly connected to the output unit.