Internal combustion engine cooling device

An internal combustion engine cooling device comprising:

• a piston fixedly mounted within a device housing coupled to a plurality of flow paths through which cooling water flows, the piston disposed facing an interior of the device housing;
• a cylinder container that advances and retreats relative to the piston and has a flange valve that opens and closes a main flow path of the cooling water;
• a thermal expansion unit provided within the cylinder container that causes the cylinder container to advance and retreat due to volumetric changes attendant upon temperature changes;
• and
• a heat-emitting element provided within a piston casing that heats the thermal expansion unit when supplied with electricity,
• wherein an insulating cover is provided to an exterior of the cylinder container at a portion of the cylinder container disposed facing the cooling water,
• wherein the insulating cover is sealed with respect to water flow,
• wherein a resinous insulating material is provided on the inside of the insulating cover to form an insulating part constituted as a multi-layered structure composed of a resinous insulating material layer and a layer of air between the insulating cover and the outer surface of the cylinder container, the multi-layered structure provided on the inside of the insulating cover up to but excluding a portion of the insulating cover disposed facing a top portion of the cylinder container,
• the portion of the insulating cover disposed facing the top portion of the cylinder container accounting for approximately one-third an entire length of the insulating cover,
• wherein the insulating cover is made of metal.

An internal combustion engine cooling device comprising:

• a piston fixedly mounted within a device housing coupled to a plurality of flow paths through which cooling water flows, the piston disposed facing an interior of the device housing;
• a cylinder container that advances and retreats relative to the piston and has a flange valve that opens and closes a main flow path of the cooling water;
• a thermal expansion unit provided within the cylinder container that causes the cylinder container to advance and retreat due to volumetric changes attendant upon temperature changes;
• and
• a heat-emitting element provided within a piston casing that heats the thermal expansion unit when supplied with electricity,
• wherein an insulating cover is provided to an exterior of the cylinder container at a portion of the cylinder container disposed facing the cooling water,
• wherein the insulating cover is sealed with respect to water flow,
• wherein the insulating cover forms a layer of air between the insulating cover and the outer surface of the cylinder container, up to but excluding a portion of the insulating cover disposed facing a top portion of the cylinder container,
• the portion of the insulating cover disposed facing the top portion of the cylinder container accounting for approximately one-third an entire length of the insulating cover,
• wherein the insulating cover is made of metal.