Internal-combustion engines – Cooling – Interrelated coolant flow and throttle control
Patent
1996-08-26
1998-02-10
Kamen, Noah P.
Internal-combustion engines
Cooling
Interrelated coolant flow and throttle control
123 4144, 123198C, F01P 714
Patent
active
057157766
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a cooling system of an internal combustion engine, and more particularly to an improved arrangement of a water pump and a thermostat of the cooling system.
2. Description of the Prior Art
A water cooling system for an internal combustion engine cools the engine by circulating water into the water jackets provided in the cylinder head and cylinder block of the engine. The system is comprised of a radiator, a water pump, a cooling fan, and a thermostat as the main parts.
SAE Technical Paper Series No. 920671 discloses a cooling system in which a water pump is located at the rear end of the cylinder block and driven by a left bank intake cam. This system reduces the complexity of external plumbing and simplifies the packaging of the accessories. A thermostat is located directly in front of the water pump. The flow path pattern of this cooling system shows that most coolant moves from the rear of the block to the front, up to the cylinder head, and finally to the back of the head.
Because of the complicated design of this conventional system, the coolant flow path has higher frictional losses contributing to a longer warm-up period.
In German Patent No. 2706954 granted to Audi NSU Auto Union AG, a water pump and a thermostat are arranged at the side of a cylinder block in a housing combined with a coolant casing. A lateral opening for inserting the thermostat forms the hosing. However, this arrangement causes a long warm period and requires a sand core for a water pump chamber.
Furthermore, a cooling system in the SAE Technical Paper Series No. 920673 discloses a reverse flow cooling system starting with water from a water pump entering the engine block and immediately flowing to the cylinder head. The major portion of the coolant still flowing through the cylinder head enters the cylinder block. This reverse flow cooling system is, however, complicated and also results in a long warm-up period.
Finally, MTZ Motortechnische Zeitschrift 51 (1990) 11 states another cooling system in which a coolant exit port and a thermostat are located at the rear end of the cylinder head, and a water pump is located in the area of the longitudinal member.
The cooling system in MTZ is disadvantageous because the distance between the water pump and thermostat is long, contributing to a negative effect due to the overall length of the engine and difficult flow control.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a cooling system for an internal combustion engine which is capable of reducing the overall length of a transversely mounted engine.
Another object of the invention is to provide a cooling system for an internal combustion engine which is capable of reducing the frictional losses during the engine warm-up period and shortening the warm-up period.
A further object of the invention is to provide a cooling system for an internal combustion engine which is capable of reducing the manufacturing costs by using a mold drag for the bypass and exit passages.
A still further object of the invention is to provide a cooling system for an internal combustion engine which is capable of providing improved accessibility to the water pump and thermostat.
To achieve these objects, a cooling system according to the present invention is comprised of a cylinder block having one or more cylinders and a water jacket therein; a cylinder head fixed by multiple connecting means to the cylinder block with a gasket therebetween and having a water jacket therein; a water pump attached to one side of the cylinder head, the water pump being driven by a cam shaft mounted on the cylinder head and circulating coolant through the cooling system; and a thermostat disposed at the downstream of the coolant toward the cylinder head from the cylinder block for selecting a flow of the coolant to either a radiator or the water pump in accordance with a temperature of the circulating coolant: wherein a flow path of the circulating coolant forms
REFERENCES:
patent: 4662320 (1987-05-01), Moriya
Daewoo Motor Co., Ltd.
Kamen Noah P.
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