TEMPERATURE SENSITIVE HYDRAULIC FAN COUPLING

摘要

The present invention provides an improvement in the structure of a temperature sensitive hydraulic fan coupling for supplying a suitable amount of cooling air to the automobile engine according to the travelling conditions of the automobile. The conventional fan coupling of the above type has had the disadvantages that since the rotation of the fan is controlled by a torque transmission mechanism depending only on the variation of ambient temperature, no supply of a suitable amount of cooling air to the engine is made especially at the time of acceleration of the engine so that the reduction of the amount of horsepower consumption and fan noise level cannot be realized satisfactorily. To eliminate the above disadvantage, the present invention uses both a temperature responsive valve member and a centrifugal valve for automatically controlling the flow of oil within the coupling thereby reducing the amount of horsepower consumption and fan noise level.