Patent ID: 7175101

Claim:
A thermostat mounting structure comprising: a coolant channel formed in a casing; an embedding hole formed in the casing across the coolant channel; a thermostat including a cylindrical valve body with a surrounding wall including an entry aperture and an exit aperture; a valving element for advancing and retracting for selectively opening and closing the entry aperture and the exit aperture; said thermostat being inserted into the embedding hole so that both apertures face the coolant channel; a cover member for covering the embedding hole via a circular rubber seal seated in a groove of the cover member and for fixing the thermostat; and a positioning structure for positioning the thermostat to a side of the cover member, wherein the positioning structure positions the thermostat by engagedly supporting an aperture end of the cylindrical valve body, wherein the aperture end of the cylindrical valve body presses the circular rubber seal, and wherein the rubber seal is circular, has a rectangular section and includes projecting pieces formed along inner and outer peripheries of the rubber seal.