Patent ID: 7179064

Claim:
A reciprocating piston compressor for a gaseous medium, comprising: a drive source including: a crankshaft having a crankshaft lug; a drive shaft for driving said crankshaft with said crankshaft lug; and, a crankcase assembly including: a crankcase connected to said drive source; a cylinder head; a cylinder-shaped component disposed between said cylinder head and said crankcase; said cylinder-shaped component having an inner cylinder running path ( 58 ) defining a path longitudinal axis ( 220 ); a piston having a piston ring and being mounted in said cylinder-shaped component for carrying out a reciprocating movement therein; a connecting rod connected to said piston and to said crankshaft lug for imparting said reciprocating movement to said piston as said crankshaft and said crankshaft lug are driven by said drive shaft; at least one outlet opening with at least one outlet valve; at least one inlet opening with at least one inlet valve; said crankshaft lug passing through an upper reversal point ( 231 ) and a lower reversal point ( 235 ) as said crankshaft and crankshaft lug are driven by said drive shaft; said drive shaft defining a first rotation point ( 232 ) and said crankshaft lug defining a second rotation point ( 231 , 234 , 235 ); a spatial axis ( 222 ) intersecting said first rotation point ( 232 ) and intersecting said second rotation point when said second rotation point passes through said upper reversal point ( 231 ); said piston ring defining a piston ring longitudinal axis ( 64 ); said piston ring longitudinal axis ( 64 ) and said path longitudinal axis ( 220 ) conjointly defining a pivot angle ( 236 , 240 ) which varies with said reciprocating movement of said piston ( 228 ); said pivot angle having a maximum during the upward movement of said piston ( 236 ) which is less than a maximum of said pivot angle during a downward movement ( 240 ) of said piston; and, said path longitudinal axis ( 220 ) being offset relative to said spatial axis ( 222 ), wherein said path longitudinal axis ( 220 ) is pivoted relative to said spatial axis ( 222 ), and wherein said cylinder head has an end piece oriented toward said crankcase; and said end piece has a surface facing toward said crankcase, and said surface has a spherical-like or barrel-like contour.