초록 ▼

A cooling system for an engine which has head and block cooling jackets and a radiator, including head and block coolant pumps, a block recirculation conduit from the block outlet to the block inlet, a main recirculation conduit from the head outlet to the head inlet via the radiator, a first juncti

A cooling system for an engine which has head and block cooling jackets and a radiator, including head and block coolant pumps, a block recirculation conduit from the block outlet to the block inlet, a main recirculation conduit from the head outlet to the head inlet via the radiator, a first junction providing sometimes communication between upstream parts of the block recirculation conduit and the main recirculation conduit, a second junction providing communication between a downstream part of the block recirculation conduit and a part of the main recirculation conduit at the downstream side of the radiator, and a mechanical non-electrical control valve assembly which is incorporated in the first junction and controls the allocation of head flow and block flow between the block recirculation conduit and the main recirculation conduit, according to the temperature of the coolant leaving the block jacket. The control valve assembly, when this temperature is below a first value, directs both head and block flow through the block recirculation conduit, bypassing the radiator; when this temperature is between the first value and a second value higher than the first value, directs the head flow through the main recirculation conduit, but directs the block flow through the block recirculation conduit; and when this temperature is above the second valve, directs both head and block flow through the main recirculation conduit.

대표청구항 ▼

For an internal combustion engine comprising: (a) a cylinder head formed with a head cooling jacket for cooling said cylinder head, said head cooling jacket being formed with a cylinder head inlet and a cylinder head outlet; (b) a cylinder block formed with a block cooling jacket for cooling said cy

For an internal combustion engine comprising: (a) a cylinder head formed with a head cooling jacket for cooling said cylinder head, said head cooling jacket being formed with a cylinder head inlet and a cylinder head outlet; (b) a cylinder block formed with a block cooling jacket for cooling said cylinder block, said block cooling jacket being formed with a cylinder block inlet and a cylinder block outlet; and (c) a radiator formed with an inlet and an outlet; a cooling system, comprising: (d) a first pump for impelling cooling fluid through said head cooling jacket from said cylinder head inlet towards said cylinder head outlet; (e) a second pump for impelling cooling fluid through said block cooling jacket from said cylinder block inlet towards said cylinder block outlet; (f) a block recirculation conduit system leading from said cylinder block outlet of said block cooling jacket so as to supply flow of cooling fluid, from a downstream part of said block recirculation conduit system, to said cylinder block inlet of said block cooling jacket; (g) a main recirculation conduit system, an upstream part of which is communicated to said cylinder head outlet of said head cooling jacket, and a downstream part of which is communicated to said inlet of said radiator; (h) a radiator output conduit system, leading from said outlet of said radiator to said cylinder head inlet of said head cooling jacket; (i) a first junction assembly between said block recirculation conduit system and said main recirculation conduit system at upstream parts thereof, which at least sometimes allows flow between said part of said block recirculation conduit system and said part of said main recirculation conduit system; (j) a second junction assembly between a downstream part of said block recirculation conduit system and a part of said radiator output conduit system, which at least sometimes allows flow between said part of said block recirculation conduit system and said part of said radiator output conduit system; (k) and a mechanical non-electrical control valve assembly which is incorporated in one of said first junction assembly and said second junction assembly and which controls the allocation of flow through said head cooling jacket and flow through said block cooling jacket between said block recirculation conduit system and said main recirculation conduit system, according to a set of parameters which include the temperature of the cooling fluid passing out of said block cooling jacket; said control valve assembly: when it detects a temperature of the cooling fluid flow passing out of said block cooling jacket of less than a first predetermined temperature, being so switched that it directs substantially all the cooling fluid flow through said head cooling jacket which is passing out through said cylinder head outlet and also substantially all the cooling fluid flow through said block cooling jacket which is passing out through said cylinder block outlet to flow into said upstream part of said block recirculation conduit system, said two cooling fluid flows being mixed within said block recirculation conduit system, not directing any substantial cooling fluid flow to flow into said upstream part of said main recirculation conduit system; when it detects a temperature of the cooling fluid passing out of said block cooling jacket of greater than said first predetermined temperature but less than a second predetermined temperature greater than said first predetermined temperature, being switched so that it directs substantially all the cooling fluid flow through said head cooling jacket which is passing out through said cylinder head outlet to flow into said upstream part of said main recirculation conduit system and through said radiator, and so that it directs substantially all the cooling fluid flow through said block cooling jacket which is passing out through said cylinder block outlet to flow into said upstream part of said block recirculation conduit system; and, when it detects a temperature of the cooling fluid passing out of said block cooling jacket of greater than said second predetermined temperature, being so switched that it directs substantially all the cooling fluid flow through said head cooling jacket which is passing out through said cylinder head outlet and also substantially all the cooling fluid flow through said block cooling jacket which is passing out through said cylinder block outlet to flow into said upstream part of said main recirculation conduit system and through said radiator, said two cooling fluid flows being mixed within said main recirculation conduit system and within said radiator, not directing any substantial cooling fluid flow into said upstream part of said block recirculation conduit system.