Patent ID: 7243620
Filing Date: 2007-07-17
Classification: F01P

Abstract:
1. A liquid-cooling device for an internal combustion engine, comprising: a radiator for cooling down cooling liquid for a liquid-cooling type internal combustion engine, by means of heat exchange between the cooling liquid and air; an inflow path for guiding the cooling liquid from a cylinder head of the engine into the radiator; a backflow path for guiding the cooling liquid cooled down by the radiator into a cylinder block of the engine; a bypass connected with the inflow path and the backflow path, for making the cooling liquid bypass the radiator; a liquid temperature controlling means installed at a junction of the bypass and the backflow path, for controlling temperature of the cooling liquid entering the cylinder block by adjusting a ratio between amounts of flows of the cooling liquid from the backflow path and from the bypass; a first circulation means installed at a downstream of the liquid temperature controlling means for circulating the cooling liquid in accordance with a revolution of the engine; a controller for controlling an operation of the engine; a head cooling path diverging from the backflow path at a position between the radiator and the liquid temperature controlling means, for guiding the cooling liquid into the cylinder head; and a second circulation means independently operated of the first circulation means and circulating the cooling liquid through the head cooling path, wherein the controller controls the operation of the second circulation means.