Power transmission unit for vehicle, comprising arrangement for optional use of hydrodynamic or mechanical mode

摘要

The unit (1) comprises an input and an output element, a hydrodynamic starting element (2), a primary (6) and a secondary wheel (7) forming a space for a service fluid, an arrangement (5) for bridging the start element (2), and a variable speed transmission (4) with an input (11) and an output element (14) permanently connected to the output element of the transmission unit (1). A bridging connection (8) facilitates the selection of a hydrodynamic or a mechanical power transmission which can be interrupted and changed as required.