Reciprocating piston type engine

Abstract

In a reciprocating piston engine having at least one cylinder (1) comprising a combustion chamber (2), the cylinder head (4) is provided with an exhaust valve housing (7) comprising a Exhaust passage (13) connected to the combustion chamber (2), which can be closed relative to the combustion chamber by means of a valve cooperating with a valve seat on the exhaust valve housing (13) and a guide device assigned to the valve (14) (19) and the operating device (20), and the exhaust valve housing is fixed on the cylinder head (4) by means of tension bolts (9) passing through the radial protrusions (22) arranged on the circumference, wherein , for the area of ​​the exhaust valve housing (7) embedded in the cylinder head (4) including the valve seat and the area including the guide (19), each is equipped with a cooling channel, preferably annular, into which cooling water can enter (17, 21), a high degree of reliability and a compact construction can be achieved in that the cooling channel (17) configured for the region of the exhaust valve housing (7) embedded in the cylinder head (4) and the Cooling ducts (21) arranged in the area including guides (19) are at least in the area of ​​radial projections (22) in the vicinity of each exhaust duct via at least one radially arranged tensioning bolt (9) ) within the connecting pipeline (23) connected to each other.

Description

technical field [0001] The present invention relates to a reciprocating piston engine, in particular to a two-stroke large diesel engine, which has at least one cylinder including a combustion chamber, and its cylinder head is provided with an exhaust valve housing, which includes an exhaust passage leading to the combustion chamber and closable relative to the combustion chamber by means of a valve cooperating with a seat part on the exhaust valve housing, and a guide and actuating device assigned to the valve, and the exhaust The gas valve housing is fastened to the cylinder head by means of tensioning bolts which pass through radial projections arranged on the circumference, wherein the exhaust valve housing engages in the region of the cylinder head with the valve seat and with the guide. The regions are each assigned a preferably annular cooling channel into which cooling water can enter. Background technique [0002] A device of this type is known from EP0076348 B1. ...

AI Technical Summary

Problems solved by technology

On the other hand, the high heating of the exhaust valve housing, in particular the bearing area assigned to the tensioning bolt, also leads to the resulting strong thermal expansion, which can lead to an excessive extension of the pretensioned tensioning bolt and thus Causes loss of preload on tensioned bolts

As a result, the exhaust valve housing is no longer reliably pressed against the cylinder head, so that so-called air leakage or escape can occur in the bearing and sealing area

The known devices therefore proved to be insufficiently reliable

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