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A six-cylinder swash plate air conditioning compressor having reciprocal double-acting pistons within a swash plate chamber positioned centrally between axially spaced front and rear cylinder blocks having intermediate suction and discharge gas crossover passageways in the cylinder blocks. The swash

A six-cylinder swash plate air conditioning compressor having reciprocal double-acting pistons within a swash plate chamber positioned centrally between axially spaced front and rear cylinder blocks having intermediate suction and discharge gas crossover passageways in the cylinder blocks. The swash plate chamber provides a crankcase for receiving lubricant returned from the front head suction chamber by means of piston blow-by during the compression stroke of the pistons. The suction pressure in the crankcase is at a higher level than the pressue in the suction gas crossover passageway while being at a lower level than the pressure in the cylinder head gas discharge chamber creating the necessary positive pressure gradient to circulate the lubricant internally within the compressor. Radial slots are formed in the cylinder block outer faces to provide first and second internal lubricant differential pressure flow passages between the shaft thrust and journal bearings and the cylinder block suction cavities communicating via the suction crossover passageway to the front head suction chamber.

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In a compressor, a cylindrical casing element, a pair of cylinder blocks disposed intermediate the ends of said cylindrical casing element defining a crankcase therebetween, front and rear cylinder heads disposed within opposite ends of said cylindrical casing element, said rear cylinder head having

In a compressor, a cylindrical casing element, a pair of cylinder blocks disposed intermediate the ends of said cylindrical casing element defining a crankcase therebetween, front and rear cylinder heads disposed within opposite ends of said cylindrical casing element, said rear cylinder head having an inlet suction line and an outlet discharge line, valve plate means interposed between said cylinder heads and said cylinder blocks and having inlet and outlet ports therein, said cylinder heads each having a circular peripheral rib and an intermediate closed rib island defining an inner suction inlet chamber and an outer discharge outlet chamber adjacent said inlet and outlet ports respectively, the inlet and outlet chambers in said rear cylinder head being in communication with said inlet suction line and said outlet discharge line, respectively; a compressor drive shaft having its ends rotatably mounted in front and rear axially spaced bores of said cylinder blocks by means of front and rear needle journal bearings, said cylinder blocks having first passage means for conveying compressed gas between said head outlet chambers, each of said cylinder blocks each having a suction cavity in their outer end faces to provide front and rear suction cavities, said cylinder blocks having second suction crossover passage means therein for connecting said front and rear suction cavities, said cylinder blocks having three pairs of aligned pumping chambers spaced radially outward from the central axis of said shaft, three double ended pistons arranged to reciprocate within associated pairs of said pumping chambers, a swash plate disposed between said cylinder blocks and secured to said shaft so as to rotate therewith, means whereby rotation of said swash plate imparts reciprocation to said double ended pistons, front and rear drive shaft needle thrust bearing assemblies between said swash plate and the inner ends of said front and rear shaft bores so as to be in communication with the crankcase chamber, wherein the improvement comprising having the rear end surface of said shaft spaced a defined distance from the inner surface of said rear valve plate means, the front end of said shaft extending through aligned openings in said front valve plate means and through said front head suction chamber whereby said front shaft bore is in communication therewith, said aligned openings of a sufficient diameter to permit oil to flow from said front shaft bore into said front head suction chamber, said rear cylinder block having a radial slot formed in its outer transverse face providing communication between said rear suction cavity and the outer end of said rear shaft bore, whereby a differential suction pressure gradient is created therebetween which cooperates with the oilrefrigerant gas piston chamber blow-by during each compressive stroke of the pistons to provide a first flow of lubricating oil through the compressor rear needle thrust and journal bearings, said first oil flow being from said crankcase through said rear thrust bearings and rear journal bearings via said rear shaft bore for radially outward flow in said rear radial slot into said rear suction cavity, and thence via said suction crossover passage into said front suction cavity for differential pressure flow into said front head suction chamber and thence via piston blow-by into said front piston chambers for differential pressure return to said crankcase, and said second oil flow being from said crankcase through said front thrust and front journal bearings and thence via said front shaft bore through said aligned shaft openings into said front head suction chamber for return to said crankcase with said first oil flow.