Abstract: A cooling circuit for a motor vehicle having a cooling medium pump that circulates a cooling medium in the cooling circuit having a hydrodynamic retarder. The cooling circuit further includes a main circuit in which the cooling medium pump and a drive motor of the motor vehicle, as well as a heat exchanger are positioned. A secondary branch of the cooling circuit includes a feed that branches off from the main circuit at a branch-off point and ends in the hydrodynamic retarder, and a return which proceeds from the hydrodynamic retarder and ends at a junction location in the main circuit. The return ends upstream of the branch-off location of the feed as viewed in a flow direction of the cooling medium in the main circuit, however on the same side of the cooling medium pump or at the branch-off location of the feed in the main circuit.

Abstract: A cooling circuit for a motor vehicle having a cooling medium pump that circulates a cooling medium in the cooling circuit having a hydrodynamic retarder. The cooling circuit further includes a main circuit in which the cooling medium pump and a drive motor of the motor vehicle, as well as a heat exchanger are positioned. A secondary branch of the cooling circuit includes a feed that branches off from the main circuit at a branch-off point and ends in the hydrodynamic retarder, and a return which proceeds from the hydrodynamic retarder and ends at a junction location in the main circuit. The return ends upstream of the branch-off location of the feed as viewed in a flow direction of the cooling medium in the main circuit, however on the same side of the cooling medium pump or at the branch-off location of the feed in the main circuit.

Abstract: The invention relates to hydrodynamic machine, especially a hydrodynamic retarder, comprising a housing, components of the hydrodynamic machine being disposed within the housing, and a balancing element. The housing being constructed of a housing material having a coefficient of thermal expansion, which may be greater than a coefficient of thermal expansion at least one of the components. The balancing element having a coefficient of thermal expansion, which may be about that or greater than the coefficient of thermal expansion of the housing material. Also, the balancing element may be axially adjustable with respect to the housing to engage at least one of the components so as to equalize a gap during heating of the hydrodynamic machine.