Oil mist lubricating system for machines

Claim 2

A machine having a housing enclosing movable parts including, means for introducing a pressurized oil mist-air mixture into the housing to lubricate said moving parts, a first conduit having an inlet connected with the housing and communicating with the interior thereof, a second conduit conducting pressurized liquid having a specific gravity different from that of the oil, said second conduit having an aspirating means therein, said first conduit having an outlet connected to said aspirating means so that the outlet is subjected to the reduced pressure created by said aspirating means whereby to create a pressure difFerential between the inlet and the outlet of the first conduit which causes the oil mist-air mixture in the housing to be discharged therefrom through said first conduit, the second conduit having an outlet communicating with a reservoir means from which the entrained air from the housing is adapted to escape.

Claim 3

A machine as called for in claim 1 wherein said liquid comprises a coolant utilized for cooling and lubricating cutting tools on the machine.

Claim 4

A machine having a housing, a rotatable shaft in said housing, bearing means in said housing journalling said shaft, at least one opening in the housing through which the shaft extends to the exterior of the housing, each opening through which the shaft extends having a seal therein surrounding the shaft, said seals separating the atmosphere within the housing from the atmosphere exterior of the housing adjacent the peripheral surface of the shaft and defining a restricted flow passageway therebetween, means forming a chamber in the housing surrounding said shaft and disposed axially between each seal and said bearing means, each of said chambers having an outlet passageway connected thereto, said outlet passageways being distinct from flow passageways across said bearing means and said seals, means for applying a sub-atmospheric pressure to the outlet passageway of each of said chambers to maintain said chambers at a pressure below atmospheric and thereby establish a pressure differential across each seal and across said bearing means which tends to produce a flow of air into said chambers across said seals and across said bearing means, means defining a second chamber in the housing spaced axially from each of the first-mentioned chambers and on the axially opposite side of said bearing means from the first-mentioned chambers, and means for directing a pressurized oil mist-air mixture into said second chamber whereby the sub-atmospheric pressure in each of said first-mentioned chambers causes said mixture to flow to each of said outlet passageways rather than through any of said seals and also causes any airborne matter passing into said first-mentioned chambers through said seals to likewise flow to each of said outlet passageways rather than across said bearing means.

Claim 5

A machine having a housing, a rotatable shaft in said housing, bearing means in said housing journalling said shaft, at least one opening in the housing through which the shaft extends to the exterior of the housing, each opening through which the shaft extends having a seal therein surrounding the shaft, said seals separating the atmosphere within the housing from the atmosphere exterior of the housing adjacent the peripheral surface of the shaft and defining a restricted flow passageway therebetween, means forming a chamber in the housing surrounding said shaft and disposed axially between each seal and said bearing means, each of said chambers having an outlet passageway connected thereto, said outlet passageways being distinct from flow passageways across said bearing means and said seals, means for applying a sub-atmospheric pressure to the outlet passageway of each of said chambers to maintain said chambers at a pressure below atmospheric and thereby establish a pressure differential across each seal and across said bearing means which tends to produce a flow of air into said chambers across said seals and across said bearing means, means defining a second chamber in the housing spaced axially from each of the first-mentioned chambers and on the axially opposite side of said bearing means from the first-mentioned chambers, and means for directing a pressurized oil mist-air mixture into said second chamber whereby the sub-atmospheric pressure in each of said first-mentioned chambers causes said mixture to flow to each of said outlet passageways rather than through any of said seals and also causes any airborne matter passing into said first-mentioned chambers through said seals to likewise flow to each of said outlet passageways rather than across said bearing means.