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A quiet cooling system for internal combustion engines includes a radial impeller and a ring radiator. The ring radiator is disposed in the vicinity of the circumference of the radial impeller and is spaced at a distance from the impeller. The ring radiator can be made integral or in the form of seg

A quiet cooling system for internal combustion engines includes a radial impeller and a ring radiator. The ring radiator is disposed in the vicinity of the circumference of the radial impeller and is spaced at a distance from the impeller. The ring radiator can be made integral or in the form of segments. The radiator includes cooling water tubes which are to carry water and have fins fastened thereto. The cooling water tubes run parallel to the fan axis and are positioned parallel to the flow direction of cooling air leaving the radial impeller.

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In a quiet cooling system for internal combustion engines, the system including a radial impeller having a circumference and a rotational axis, a ring radiator disposed about the circumference of the radial impeller at a distance from the latter, the radiator having cooling water tubes which are to

In a quiet cooling system for internal combustion engines, the system including a radial impeller having a circumference and a rotational axis, a ring radiator disposed about the circumference of the radial impeller at a distance from the latter, the radiator having cooling water tubes which are to carry water, and cooling fins fastened to the tubes, wherein said cooling water tubes run substantially parallel to said rotational axis of said impeller and said fins are located parallel to flow direction of cooling air leaving said radial impeller, the improvement wherein said radial impeller is provided with a cover plate having a rounded portion and including an inlet nozzle which projects into said radial impeller, said inlet nozzle being shaped to define a gap between said radial impeller and said inlet nozzle so that the main flow receives an outwardly directed component and the air entering between said impeller and said nozzle is supplied at least nearly tangentially to said rounded portion of said cover plate, and wherein said inlet nozzle is connected to said cover plate of said radial impeller and turns with the latter.