Temperature sensitive type fluid fan coupling apparatus

Abstract

Herein disclosed is a temperature sensitive fluid type fan coupling apparatus which comprises: a sealed container including a casing and a cover, a partition dividing the inside of the sealed container into an oil sump and a torque transmission chamber housing the drive disc; a dam formed in a portion of such an inner circumference of the sealed container as faces the outer circumference of the drive disc, on which the oil is collected at the time of rotation; a circulation passage communicating with the dam and leading from the torque transmission chamber to the oil sump; a valve member fitted in the oil sump for opening an outflow adjusting orifice leading to the torque transmission chamber, if the ambient temperature exceeds a preset value, and closing the same if below the preset value; and a spiral temperature sensing element mounted on the front face of the cover and associated with the valve member if spirally deformed in accordance with the temperature change. The effective contact area of the oil at a torque transmission gap is increased or decreased to control the torque transmission from the rotating shaft at the drive side to the sealed container at the driven side. The output adjusting orifice is formed through a portion of the inner circumference of the cover forming the oil sump. A sealing portion for sliding in the circumferential directions to open or close the outflow adjusting orifice is formed at the leading end of the valve member.