A hydrodynamic retarder (1) has a stator (2), a rotor (3) and an oil reservoir (9) operated by an electric motor by means of an actuator (7). A piston (8) or a membrane is used to operate the oil reservoir. A heat exchanger (5) links to a vehicle's coolant...

In the hydraulic circuit a control valve (5) and a throttling valve (6) are connected in parallel with the positive displacement circulation pump (4). On closure, the control valve directs fluid through the throttle valve (6), to brake the shaft (3).

The automatic transmission has a hydraulic system to operate and control a hydrodynamic retarder (6) which has a retarder chamber (9) constructed between a rotor (7) and a stator (8). The filling level of the retarder chamber is variable depending upon a p...

The procedure for the limiting of braking power of a retarder in a brake system as a function of the temperature of cooling medium is carried out so that at the end of a predetermined period of time during which the cooling medium temperature has remained ...

The invention relates to a method for improving the availability of a prime mover in drive systems with a braking device, in particular a hydrodynamic retarder, wherein a cooling medium circuit is associated with the prime mover and the braking device and ...