Patent ID: 8123495

Claim:
A positive displacement reciprocating compressor comprising one or more cylinder units ( 30 ), respective pistons ( 5 , 5 ′) reciprocating inside said cylinder units ( 30 ), at least one motor ( 25 ) having a respective drive shaft ( 3 ′) with a planet carrier ( 3 ), a planet ( 20 ) which, in combination with said planet carrier ( 3 ) and with a crown wheel ( 2 ; 26 ) with internal toothing realises a so-called “non-conventional” crank mechanism in which a point “B” on the pitch line of a pinion ( 4 ) of the planet ( 20 ) moves according to a reciprocating rectilinear motion during the operation of the compressor, the compressor further including a housing ( 27 ) with a corresponding cover ( 32 ) and being characterised in that at least a part, but preferably all, of the components of the planet ( 20 ) of said “non-conventional” crank mechanism, are formed of sintered material, preferably sintered steel; the positive-displacement reciprocating compressor further comprises a lubrication system ( 31 ; 31 a , 31 b ; 31 c ) which sends in an accurate manner lubricant oil under pressure to surfaces which are in mutual contact and in relative rotational motion to each other and which belong to components ( 3 , 20 ) of said “non-conventional” crank mechanism, said lubrication system ( 31 ; 31 a ; 31 b ; 31 c ) drawing the mechanical energy required for its motion directly from the planet carrier ( 3 ), without requiring, however, any other kind of energy supply means.