US 5,289,803 AGranted

Cooling system for a water cooled internal combustion engine

AssigneeNippon Soken, Inc.

InventorsRyuichi Matsushiro, Toru Kosuda, Sigeo Sasao, Hiroyuki Fukunaga, Yasumasa Ikumi

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Abstract

A cooling system for a water cooled internal combustion engine for a vehicle includes an engine body having a water jacket therein. The system comprises a radiator and a pump chamber. The pump chamber is in communication with the water jacket. A water pump creates a flow of water into the water jacket. A first main conduit has an end connected to the water jacket at the engine outlet and another end connected to the radiator. A second main conduit has an end connected to the radiator and another end connected to the pump chamber. A reservoir tank is arranged at a position more elevated than the radiator, and a supplementation conduit connects a bottom portion of the reservoir tank with an upper part of the pump chamber. A thermostat valve is arranged between the second main conduit and the pump chamber at a position upstream from a location where the supplementation conduit is connected to the pump chamber. A check valve is arranged in parallel with the thermostat valve and allows the introduction of air from the pump chamber to the second main conduit while preventing a flow of the air from the second main conduit to the pump chamber. The check valve is in a normally closed position under the force of gravity and is switchable to an opened position in response to a predetermined amount of air pressure in the pump chamber.

Claims6

Dependent claims

A cooling system for a water cooled internal combustion engine for a vehicle, the engine including an engine body with a water jacket therein, said system comprising:

a radiator;
a pump chamber disposed at a top portion of the engine body, the pump chamber being in fluid communication with the water jacket;
a water pump disposed in the pump chamber for creating a forced flow of water into the water jacket;
a first main conduit having an end connected to the water jacket at an outlet of the engine for receiving the forced flow of water from the engine water jacket and another end connected to the radiator for introducing the water into the radiator;
a second main conduit having an end connected to the radiator for receiving the water therefrom and another end connected to the pump chamber for introducing the flow of water into the engine water jacket;
a reservoir tank disposed at a position more elevated than the radiator;
a supplementation conduit for connecting a bottom portion of the reservoir tank with an upper part of the pump chamber;
a thermostat valve arranged between the second main conduit and the pump chamber at a position upstream from a location at which the supplementation conduit is connected to the pump chamber, the thermostat valve controlling the flow of water in the radiator in response to a temperature of the water;
and
a check valve arranged in parallel with the thermostat valve for allowing an introduction of air from the pump chamber to the second main conduit while preventing a flow of the air from the second main conduit to the pump chamber, said check valve comprising a fixed plate member extending transverse to the flow of the water from the second main conduit to the pump chamber and a resilient read valve member disposed on a side of the plate member remote from the pump chamber, said plate member having an edge defining a vent hole, said reed valve member being resiliently biased against said edge for maintaining said check valve in a normally closed position and being operable in response to a predetermined amount of air pressure in said pump chamber to open the check valve against the resiliency of the reed valve member.

7 more elements

A cooling system for a water cooled internal combustion engine for a vehicle, the engine including an engine body with a water jacket therein, said system comprising:

a radiator;
a pump chamber arranged at a top portion of the engine body, the pump chamber being in fluid communication with the water jacket;
a water pump arranged in the pump chamber for creating a forced flow of water into the water jacket;
a first main conduit having an end connected to the water jacket at an outlet of the engine for receiving the forced flow of water from the engine water jacket and another end connected to the radiator for introducing the water into the radiator;
a second main conduit having an end connected to the radiator for receiving the water therefrom and another end connected to the pump chamber for introducing the flow of water into the engine water jacket;
a reservoir tank arranged at a position more elevated than the radiator;
a supplementation conduit for connecting a bottom portion of the reservoir tank with an upper part of the pump chamber;
a thermostat valve arranged between the second main conduit and the pump chamber at a position upstream from a location where the supplementation conduit is connected to the pump chamber, the thermostat valve controlling the flow of water in the radiator in response to a temperature of the water;
a check valve arranged in parallel with the thermostat valve, the check valve being arranged for allowing an introduction of air from the pump chamber to the second main conduit while preventing a flow of air from the second main conduit to the pump chamber, said check valve being in a normally closed position under the force of gravity and being switchable to an opened position in response to a predetermined amount of air in the pump chamber;
and
a by-pass conduit for connecting the water jacket at a bottom portion thereof with the upper part of the pump chamber to enable recirculation of the water through the by-pass conduit when the thermostat is in its closed position.

8 more elements

Dependencies are inferred from the claim text.