The utility model has the advantages of relating to the technical field of silicone oil clutches for fans on automobiles. It is designed to reduce the impact of collision. Wherein the driving shaft is fixed in the middle of the shell through a bearing, the driving disc is fixed on the driving shaft, and the front cover and the shell are fixed together; the driven disc divides the space between the front cover and the shell into a silicone oil hole cavity at the joint surface of the front cover and the shell; a cogging structure is arranged between the driving plate and the end surface of the shell; the temperature-sensitive metal sheet is fixed on the outer surface of the front cover; the temperature-sensitive metal sheet drives the valve plate in the silicone oil hole cavity in the front cover to act; and the valve plate cooperates with the valve hole on the driven plate to open and close. Characterized in that the temperature-sensitive metal plate is a plate-shaped bimetal, one surface of which is attached to the outer end of the pin shaft fixed in the front cover, the inner end of the pin shaft in the silicone oil cavity is pressed against the upper part of the valve plate, and the lower part of the valve plate is fixed with the driven plate. It has the advantages of good anti-collision effect, long service life and good performance, and is suitable for