Cylinder liner with internal cooling ducts for internal combustion reciprocating engines

Claim 2

A cylinder liner for internal combustion reciprocating engines, of the type having a neck which in use of the liner extends between a cylinder block and a cylinder head of the engine and means defining a number of internal cooling ducts in the neck for the through flow of a cooling liquid which in use of the liner enters these ducts from a means forming an annular space surrounding the part of the cylinder liner located within the cylinder block and which emerges from the said ducts into a means forming a collection chamber which surrounds the neck and from which the cooling liquid is directed towards the cylinder head, wherein the improvement consists in the means defining each of the internal ducts in the liner comprising: means defining a blind hole communicating with the said part of the liner and extending towards the cylinder head; means defining a hole extending transversely with respect to the blind hole and communicating with the latter to provide communication between the blind hole and the collection chamber, the transverse hole being located adjacent the open end of the blind hole and debouching on the outside of the cylinder liner in a region different from that of the neck, and baffle means extending longitudinally within the blind hole and subdividing it into a flow passage extending from the end of the blind hole which communicates with the annular space up to a point adjacent the blind end of the blind hole, and into a return passage extending from said point adjacent the blind end, at which it communicates with said flow passage, to the associated transverse hole which communicates with the collection chamber.

Claim 3

The cylinder liner defined in claim 1, wherein the baffle means inserted in the blind hole of each of the internal ducts comprises a tubular baffle having a first portion the cross section of which corresponds to that of the blind hole, the first portion extending within the blind hole from the end of the latter communicating with the annular space to a point situated adjacent and not beyond the associated transverse hole, and a second portion of smaller cross section than the blind hole extending within the latter as a continuation of the first portion towards the blind end of the blind hole.

Claim 4

The cylinder liner defined in claim 1, wherein the blind holes extend obliquely with respect to the axis of the cylinder liner.

Claim 5

An internal combustion reciprocating engine having a cylinder block formed with cylinders, a cylinder head mounted on said cylinder block, cylinder liners within said cylinders, means in the cylinder block defining annular spaces surrounding the parts of the cylinder liner located within the cylinder block, each cylinder liner having a neck which extends between the cylinder block and the cylinder head to delimit a respective combustion chamber in the cylinder, means defining a collection chamber surrounding said neck, and means defining internal cooling ducts in said neck for the through flow of a cooling liquid which in use of the engine enters the ducts from said annular space and leaves the ducts to enter said collection chamber, wherein the improvement consists in the means defining each of the internal ducts in each liner comprising: means defining a blind hole communicating with the said part of the liner and extending towards the cylinder head; means defining a hole extending transversely with respect to the blind hole and communicating with the latter to provide communication between the blind hole and the collection chamber, the transverse hole being located adjacent the open end of the blind hole and debouching on the outside of the cylinder liner in a region different from that of the neck, and baffle means extending longitudinally within the blind hole and subdividing it into a flow passage extending from the end of the blind hole which communicates with the annular space up to a point adjacent the blind end of the blind hole, and into a return passage extending from said point adjacent the blind end, at which it communicates with said flow passage, to the associated transverse hole which communicates with the collection chamber.

Claim 6

An internal combustion reciprocating engine having a cylinder block formed with cylinders, a cylinder head mounted on said cylinder block, cylinder liners within said cylinders, means in the cylinder block defining annular spaces surrounding the parts of the cylinder liner located within the cylinder block, each cylinder liner having a neck which extends between the cylinder block and the cylinder head to delimit a respective combustion chamber in the cylinder, means defining a collection chamber surrounding said neck, and means defining internal cooling ducts in said neck for the through flow of a cooling liquid which in use of the engine enters the ducts from said annular space and leaves the ducts to enter said collection chamber, wherein the improvement consists in the means defining each of the internal ducts in each liner comprising: means defining a blind hole communicating with the said part of the liner and extending towards the cylinder head; means defining a hole extending transversely with respect to the blind hole and communicating with the latter to provide communication between the blind hole and the collection chamber, the transverse hole being located adjacent the open end of the blind hole and debouching on the outside of the cylinder liner in a region different from that of the neck, and baffle means extending longitudinally within the blind hole and subdividing it into a flow passage extending from the end of the blind hole which communicates with the annular space up to a point adjacent the blind end of the blind hole, and into a return passage extending from said point adjacent the blind end, at which it communicates with said flow passage, to the associated transverse hole which communicates with the collection chamber.