Temperature-responsive fluid coupling device

摘要

A temperature-responsive fluid coupling device for driving a cooling fan of an internal combustion engine includes a ball check valve mechanism which is installed in a fluid return passage and a pumping passage, respectively. The valve mechanism comprises a ball check valve positioned in a slidable state in a radial direction, a spring biasing the check valve toward a closed position thereof, and a cap member supporting the spring and limiting a distance of a sliding movement of the check valve.