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A screw compressor assembly includes a motor housing section, a compressor section and an oil separator downstream of the compressor discharge port. The motor housing section defines a flow path for suction gas traveling to the working chamber of the compressor so that the compressor drive motor is

A screw compressor assembly includes a motor housing section, a compressor section and an oil separator downstream of the compressor discharge port. The motor housing section defines a flow path for suction gas traveling to the working chamber of the compressor so that the compressor drive motor is cooled by suction gas. The motor housing section also internally defines an integral heat exchange structure through which a passage for the flow of oil is defined. Discharge pressure in the oil separator drives separated oil into the passage in the motor housing heat exchange structure prior to the delivery of such oil to compressor surfaces requiring lubrication. The oil flowing through the integral heat exchange structure is cooled by the suction gas passing over the surface of the heat exchange structure interior of the motor housing.

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A lubrication system for a compressor assembly through which a lubricant circulates and in which the pressure of a gas is increased from alower to a higher pressure when the assembly is in operation, the assembly having locations that are at a pressure less than the higher pressure and which require

A lubrication system for a compressor assembly through which a lubricant circulates and in which the pressure of a gas is increased from alower to a higher pressure when the assembly is in operation, the assembly having locations that are at a pressure less than the higher pressure and which require lubrication when the assembly is operating, comprising: a compressor defining a working chamber in which a pair of screw rotors are meshingly disposed to compress gas; means for separating entrained lubricant from gas compressed in said working chamber, said separating means having a sump connected by a lubricant passage to said locations in said assembly requiring lubrication, the interior of said separating means, including said sump, being at said higher pressure when said compressor assembly is operating, the difference in pressure between said sump and said locations requiring lubrication causing lubricant to be continuously driven from said sump, through said passage and to said locations requiring lubrication when said compressor assembly is operating; means for driving said compressor, said driving means being cooled by gas at said lower pressure; and means for enclosing said driving means, the interior of said enclosing means both directing the flow of gas at said lower pressure into a heat exchange relationship with said driving means and defining a path for the flow of said lower pressure gas to said compressor, said enclosing means having an integral internal heat exchange structure which defines a portion of said lubricant passage, said structure being exposed to the flow of said lower pressure gas through said enclosing means so that lubricant flowing through said passage is cooled by said lower pressure gas subsequent to being driven from said sump and prior to reacing said locations requiring lubrication.