| 摘要 |
Hydrodynamic unit having a lock-up device to prevent slip of the rotors subsequent to the attainment of a predetermined input speed. In one form of the invention camming balls are moved outwardly on special ramps in response to rotary drive of the input by centrifugal force of predetermined magnitude to effect the drive engagement of an input driven locking plate and a turbine member. The locking plate is moved from drive engagement with the turbine member by spring means when the magnitude of the centrifugal force developed by the balls is reduced to a predetermined value for torque transmittal through the hydraulic unit. In another form of the invention a centrifugally operated valve closes off an oil exit port of a hydraulic pump operatively disposed between the input and output of the converter or coupling at predetermined input speeds to hydraulically lock the pump and lock-up the hydrodynamic unit. As the magnitude of the centrifugal force developed by the valve diminishes to a predetermined value, spring means moves the valve to open the discharge port so that the pump pumps fluid therethrough allowing the hydraulic operation of the hydrodynamic unit.
|
