| 摘要 |
A hydrodynamic retarder for vehicles, especially for motor vehicles, with an internal working circulation within a working space having at least one rotating blade wheel and at least one stationary blade wheel, with an external cooling circulation that can be filled by way of a filling and discharge line out of a pressure-medium-actuated filling cylinder and which includes a by-pass or control valve, and with a lubricating line which connects the sealing spaces of the retarder shaft both with the center of the working space as also with a control member of the control valve and with a reservoir tank that is arranged at a higher level than the retarder and is additionally connected with the filling and discharge line by way of a closure valve. A first check valve, opening in the direction toward the working space, is arranged in the connection between the lubricating line and the center of the working space while a second check valve, constructed as a venting valve, is arranged in a connection line disposed between an inlet of the retarder and the reservoir tank. The second check valve opens in the direction toward the retarder inlet of the cooling circulation, and a throttle is provided for controlling the flow through this second check valve.
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