Piston for the crosshead engine

Abstract

A piston for a crosshead engine, especially a two-stroke large diesel engine, comprising a piston upper part (2) mounted on a flange (9) above the piston rod (1), the piston upper part having A piston head (3) connected to a surrounding piston skirt (4), which covers a central cooling chamber (8) via a supply duct (10) provided in the piston rod (1) Coolant can be supplied and discharged via a return line (11) arranged radially outside the supply line (10), whereby good cooling can also be achieved in the case of an upwardly raised piston head (3) The effect is that at the upper end of the piston rod (1) there is provided an insert (17) located in the centrally raised cooling chamber (8), which insert has a connection to the opposite inner side of the piston head (3). The nozzles ( 21 ) of the supply line ( 10 ) are also surrounded by an annular space ( 22 ), which forms a coolant collecting space.

Description

technical field [0001] The invention relates to a piston for a crosshead engine, in particular a two-stroke large diesel engine, comprising a piston upper part mounted in the region of the upper end of the piston rod, the piston upper part having a piston skirt connected to a surrounding The upper piston head covers a central cooling chamber which can be supplied with coolant via a supply line arranged in the piston rod and which can be discharged via a return line arranged radially outside the supply line. Background technique [0002] A device of this type is known from DE 199 62 325 C2. In this known device, a coolant jet emerges from the upper end of a supply line formed by a central bore through a piston rod, which emerges in the central region of the inner side of the piston head. The area is depressed in the center here. This results in a contour of the upper boundary of the cooling chamber that gradually rises radially outward from the center. The coolant impingin...

AI Technical Summary

Problems solved by technology

A disadvantage in this respect is that during the downward movement of the piston, the coolant is squeezed into the cooling bores and forms a practically fixed fill there, which suppresses the jets emerging from the nozzles and cannot be penetrated by them, This adversely affects the cooling effect

In addition, the nozzles here are not arranged concentrically to the bore axis, but rather are inclined, so that the jets emerging from them impinge on the side walls of the respectively assigned bore, which can affect the cooling of the bore bottom.

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