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A hydrodynamic retarder with a stator blade wheel and a rotor blade wheel whose blades together fill the work chamber for working liquid. Slot shaped inlet openings permit entrance of working liquid to the working chamber. The inlet openings are located at the radially inner region of the rotor blad

A hydrodynamic retarder with a stator blade wheel and a rotor blade wheel whose blades together fill the work chamber for working liquid. Slot shaped inlet openings permit entrance of working liquid to the working chamber. The inlet openings are located at the radially inner region of the rotor blade wheel toward the retarder shaft. Slot shaped outlet openings permit outlet of working fluid. The outlet openings are at the radially outer region of the rotor blade wheel. The slots are oriented to follow the incline of the blades of the rotor blade wheel. The inlet slots each trail a respective rotor wheel blade while the outlet slots each lead that blade in the movement direction of the rotor blade wheel. Particular thicknesses of blades and particular angular sizes of the inlet and the outlet slot openings are disclosed.

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A hydrodynamic retarder comprising: a housing defining a torus shaped work chamber; a stator blade wheel supported in the housing, including blades extending into the work chamber and fixed against rotation around the housing; a rotor blade wheel in the housing including blades extending into the wo

A hydrodynamic retarder comprising: a housing defining a torus shaped work chamber; a stator blade wheel supported in the housing, including blades extending into the work chamber and fixed against rotation around the housing; a rotor blade wheel in the housing including blades extending into the work chamber and which extend toward the blades of the stator blade wheel; a shaft on which the rotor blade wheel is supported for rotating; the stator blades and the rotor blades together generally filling the torus shaped work space of the work chamber; a set of slot-shaped inlet filling openings in at least one of the rotor blade wheel and the stator blade wheel for filling the work chamber with work liquid; a pathway in the housing for delivering work liquid to the inlet openings; and spaced from the inlet filling openings, a set of slot-shaped outlet openings provided on at least one of the stator blade wheel and the rotor blade wheel for emptying the work chamber of work liquid; means for conducting work liquid away from the outlet openings from the work space; said inlet and outlet openings being near and along respective blades of the wheel in which said openings are formed, so that the surfaces of the wheel between said blades are substantially uninterrupted by said openings, so that the radial flow of work liquid between said blades is substantially undisturbed.