Functionally optimized design of a cylinder liner

Abstract

A cylinder of an internal combustion engine, in which cylinder liner an oscillating piston is guided on a running surface wherein the cylinder line is fixed vertically by means of a collar between a cylinder housing and a cylinder head. The wet cylinder includes an outer side which deviates from a circular shape and/or a rotationally asymmetrical outer contour of the collar. The cylinder liner is fitted in a positionally oriented manner in a corresponding receptable of the cylinder housing.

What is claimed: 
     
         1 . The cylinder liner of a cylinder for an internal combustion engine in which a reciprocating piston is guided on a running surface, wherein the cylinder liner is attached vertically to a collar between a cylinder housing and a cylinder head, characterized in that an outer side and/or an outer contour of the collar of the wet cylinder liner are executed rotationally asymmetrically and the outer side and/or the outer contour is fitted aligned in a matching seat of the cylinder housing. 
     
     
         2 . The cylinder liner of a cylinder for an internal combustion engine in which a reciprocating piston is guided on a running surface, wherein the cylinder liner is fixed vertically in a cylinder housing, characterized in that the cylinder liner includes in the axial direction at least two sections formed of different materials that are materially joined to form one unit and the cylinder liner can be used both as a wet and a dry cylinder liner. 
     
     
         3 . The cylinder liner from  claim 2 , wherein the sections joined to form the cylinder liner are produced from materials having different strengths and/or different temperature resistance. 
     
     
         4 . The cylinder liner from  claim 1 , wherein the outer side and/or the outer contour of the collar of the cylinder liner has an oval, elliptical, prismatic free form or a geometry deviating from a circular shape. 
     
     
         5 . The cylinder liner from  claim 1 , wherein identical or divergent wall thicknesses (y 1 , y 2 ) result towards a pressure side or a counter-pressure side of the cylinder liner that exceed the wall thicknesses (x 1 , x 2 ) that are aligned along a longitudinal axis. 
     
     
         6 . The cylinder liner from  claim 1 , wherein the collar of the cylinder liner forms identical or divergent collar widths (y 3 , y 4 ) towards the pressure side or the counter-pressure side that exceed the collar widths aligned along the longitudinal axis. 
     
     
         7 . The cylinder liner from  claim 1 , wherein in an area that lies below the BDC of the lowest piston ring of the piston towards a crankshaft the cylinder liner has a running surface for the piston on the inside only facing the pressure side and the counter-pressure side. 
     
     
         8 . The cylinder liner from  claim 1 , wherein the cylinder liner includes partially oppositely located recesses in the direction of the longitudinal axis of the cylinder housing. 
     
     
         9 . The cylinder liner from  claim 1  wherein the outer side of the cylinder liner is coated at least locally. 
     
     
         10 . A method for producing outer contours of a cylinder liner from  claim 1 , characterized in that oval turning or off-round turning can be used to create geometrically shaped topographies on the outer side of the cylinder liner. 
     
     
         11 . The method for producing a cylinder liner that includes removal of material from local areas from  claim 10 , wherein the production includes:
 production of the cylinder liner or of the sections of the cylinder liner by a primary shaping process, specifically a forging or casting process;   joining the sections using a positive material connection;   finishing the outer side of the cylinder liner by off-round or oval turning;   final machining of the inner running surface of the cylinder liner; and   the cylinder liner of cooling lubricant, lubricants and adhering chips.   
     
     
         12 . The method from  claim 11  further comprising:
 coating of the outer side of the cylinder liner. 
 
     
     
         13 . The cylinder liner from  claim 2 , wherein identical or divergent wall thicknesses (y 1 , y 2 ) result towards a pressure side or a counter-pressure side of the cylinder liner that exceed the wall thicknesses (x 1 , x 2 ) that are aligned along a longitudinal axis. 
     
     
         14 . The cylinder liner from  claim 2 , wherein the cylinder liner includes partially oppositely located recesses in the direction of the longitudinal axis of the cylinder housing. 
     
     
         15 . The cylinder liner from  claim 2  wherein the outer side of the cylinder liner is coated at least locally. 
     
     
         16 . A method for producing outer contours of a cylinder liner from  claim 2 , characterized in that oval turning or off-round turning can be used to create geometrically shaped topographies on the outer side of the cylinder liner.