Patent ID: 8221282

Claim:
An electro-mechanical transmission including an input member, an output member and a plurality of planetary gears and torque transfer devices, the electro-mechanical transmission further comprising: a synchronizer selectively engaging and disengaging input and output components of the transmission, the synchronizer comprising a piston sequentially applying a synchronizing force and a clutching force when said synchronizer is activated, a blocker member, an input cone associated with said input components and extending radially inside said blocker member, an output cone associated with said output components and extending radially inside said blocker member and having a radius different than said input cone, a sleeve member coupled to said piston member and compressing said blocker member thereby generating a friction force between said input and output cones to synchronize rotational speeds between the input and output components in response to said synchronizing force and, after the rotational speeds between the input and output components are synchronized to establish a clutch slip of zero between the input and output components, sequentially engaging said output components to said input components in response to said clutching force, and a biasing member providing a biasing force against said piston and sleeve member in a direction opposite to said synchronizing and clutching forces, thereby disengaging said output components from said input components when said synchronizer is deactivated.