Engine block of a diesel engine with integrated cylinder head, and casting method
An engine block of a diesel engine cast integrally with the cylinder head, with a number of cylinders in line, including an outer wall ( 21 ) and a cylinder wall ( 13 ) for each cylinder with a first cooling space ( 22 ) for a liquid cooling medium and with a second cooling space ( 25 ) on top of a cylinder ceiling ( 14 ) with openings ( 15,16 ) for gas exchange valves, the first cooling space ( 22 ) enclosing all the cylinder walls ( 13 ) entirely. In order to strengthen and cooling the vulnerable zone at the transition from cylinder wall ( 13 ) to cylinder ceiling ( 14 ) the first cooling space of adjacent cylinders forms a gap ( 23 ) with a width ( 35 ) constant or increasing from top to bottom.
1. Engine block of a diesel engine cast integrally with a cylinder head, comprising a plurality of cylinders in line, including an outer wall ( 21 ) and a cylinder wall ( 13 ) for each cylinder with a first cooling space ( 22 ) for a liquid cooling medium between them and with a second cooling space ( 25 ) on top of a cylinder ceiling ( 14 ) with openings ( 15 , 16 ) for gas exchange valves, the first cooling space ( 22 ) enclosing all the cylinder walls ( 13 ) entirely and extending all around upwards beyond the cylinder ceiling ( 14 ), wherein the first cooling space ( 22 ) between the cylinder walls ( 13 ) of adjacent cylinders forms a gap ( 23 ) with a width ( 35 ) which is one of (a) constant and (b) increasing from top to bottom, wherein the gap ( 23 ) extends upward beyond the cylinder ceiling ( 14 ) and ends in an extension ( 24 ) overlapping and partly embracing the cylinder ceiling ( 14 ).
2. Engine block according to claim 1 , wherein the first cooling space ( 22 ) overlaps ( 30 ) the cylinder ceiling ( 14 ) at least in the region of the openings ( 16 ) for the exhaust valves.
3. Engine block according to claim 1 , wherein a first horizontal transverse bore ( 27 ) is provided by means of which the two cooling spaces ( 22 , 25 ) are connected, the first transverse bore ( 27 ) penetrating an outer wall ( 21 ) and hitting the first cooling space ( 22 ), which cooling space ( 22 ) reaches beyond the cylinder ceiling ( 14 ), wherein a second horizontal transverse bore ( 33 ) is provided for connecting the two cooling spaces ( 22 , 25 ), the bore ( 33 ) penetrating the outer wall ( 21 ′) on the opposite side and ending near the injector, in this way the cooling liquid flowing upwards from the first cooling space ( 22 ) is directed to the injector ( 17 ).
4. Engine block according to claim 1 , wherein the outer wall ( 21 ) and the cylinder wall ( 13 ) for each cylinder are integral portions of the engine block cast integrally with the cylinder head.
5. Process for casting an engine block according to claim 1 , wherein parts of a core are formed separately in core moulds and a core part ( 22 *) corresponding to the first cooling space ( 22 ) is made in the region of the gap ( 23 ) between adjacent cylinders by means of separate inserts ( 43 , 53 ) having a shape which corresponds to the constant width of the gap or the width of the gap increasing from top to bottom, wherein the inserts ( 53 ) are slid into the core mould for shaping the core in vertical direction ( 57 ), and the core part made in the core mould ( 50 ) including the insert ( 53 ) is lifted out vertically and the insert is removed sideways.
6. Process according to claim 5 , wherein the insert ( 53 ) has a dove-tail shaped guideway ( 54 ) at its backside which is opposite the side facing the core part ( 22 *).