Internal combustion engine

Details Internal combustion engine Internal combustion engine

1999-11-30

2001-03-20

Wolfe, Willis R. (Department: 3747)

Internal-combustion engines

Cooling

With jacketed head and/or cylinder

C123S041310, C123S04182R

Reexamination Certificate

active

06202603

ABSTRACT:

The present invention relates to an internal combustion engine comprising a cylinder block with at least two cylinders and at least two exhaust valves per cylinder, a slit in the cylinder block between each pair of cylinders, and a cooling system which comprises an inlet opening for cooling liquid, formed in the cylinder block, an outlet opening for cooling liquid, formed in a cylinder head, a restriction member which is arranged in the cylinder block and guides most of the cooling water flow to an intake side of the cylinder block, and cooling liquid channels in the cylinder head which are chiefly located on an exhaust side of the cylinder head.
An internal combustion engine having such a cooling system has already been disclosed in U.S. Pat. No. 5,558,048. The cooling liquid is conveyed into the cylinder block and is led to the intake side of the cylinder block by means of a restriction member. The cooling liquid passes the cylinders in the cylinder block and onwards to the cylinder head via an opening. However, the cooling liquid is also allowed to flow through slits which are formed between each cylinder. Each slit communicates with a cooling liquid channel which opens out between each cylinder in the cylinder head.
In internal combustion engines with cooling systems of this type, there is often inadequate cooling of the area between the exhaust valve seats for each cylinder in the cylinder head, since the geometry of the cylinder head is often configured so that the velocity of flow of the cooling liquid is low at the area between the exhaust valve seats.
One object of the present invention is to provide satisfactory cooling of the area between the exhaust valve seats in the cylinder head of an internal combustion engine.
Another object of the present invention is to make available a locally controlled cooling of the area between the exhaust valve seats of an internal combustion engine.
Yet another object of the present invention is to provide a satisfactory cooling liquid flow through the slits between each pair of cylinders in order thereby to create a satisfactory and uniform cooling of cylinders and cylinder liners and thereby counteract deformation of cylinder and liner.
According to the invention, these and further objects are achieved by the fact that the cooling liquid channels open into the cylinder head in an area between the exhaust valve seats for each cylinder.
An internal combustion engine having such a cooling system creates a satisfactory and uniform cooling of the cylinders and the cylinder liners, and at the same time a satisfactory cooling of the cylinder head in the region between the exhaust valve seats is obtained, which among other things makes it easier to achieve stoichiometric combustion at high load.


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