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A lubrication system for supplying lubricants between two environments is provided. The first environment is disposed within a first housing and the second environment is disposed within a second housing having a supply opening and an exhaust opening. The system includes a lubricant supply tube disp

A lubrication system for supplying lubricants between two environments is provided. The first environment is disposed within a first housing and the second environment is disposed within a second housing having a supply opening and an exhaust opening. The system includes a lubricant supply tube disposed within the supply opening and configured to supply lubricant from the first environment to the second environment. The system also includes a receptacle disposed within the second housing and configured to receive lubricant supplied from the supply tube and to hold a predetermined volume of the lubricant. A check valve is disposed within the second housing and is in fluid communication with the exhaust opening. The check valve is configured to receive overflow lubricant from the receptacle, if the lubricant exceeds the predetermined volume and to provide a seal between the first and second environments in response to a pressure differential therebetween.

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We claim: 1. A lubrication system for supplying lubricant between a first environment and a second environment, wherein the first environment is disposed within a first housing and the second environment is disposed within a second housing, the second housing having a supply opening and an exhaust

We claim: 1. A lubrication system for supplying lubricant between a first environment and a second environment, wherein the first environment is disposed within a first housing and the second environment is disposed within a second housing, the second housing having a supply opening and an exhaust opening, the system comprising: a lubricant supply tube disposed within the supply opening and configured to supply lubricant from the first environment to the second environment; a receptacle disposed within the second housing and configured to receive lubricant supplied from the supply tube and to hold a predetermined volume of the lubricant therein; and a check valve disposed within the second housing and in fluid communication with the exhaust opening, the check valve configured to receive overflow lubricant from the receptacle, if the lubricant exceeds the predetermined volume, and to provide a seal between the first and second environments in response to a pressure differential therebetween. 2. The system of claim 1, further comprising: a flow regulator coupled to the supply tube and configured to regulate a rate at which the lubricant flows from the first environment to the second environment. 3. The system of claim 2, wherein the flow regulator comprises at least one regulator orifice. 4. The system of claim 1, further comprising: a shaft having a first portion disposed within the second housing and a second portion extending out of the second housing; and an aperture formed in the second portion of the shaft. 5. The system of claim 4, wherein the aperture is in communication with the first and the second environments and configured to respond to a pressure difference therebetween. 6. The system of claim 1, wherein the exhaust opening is configured to receive the overflow lubricant from the check valve and provide an outlet for the overflow lubricant out of the second environment. 7. The system of claim 1, further comprising a third environment disposed within a third housing, wherein the third housing is coupled between the first housing and the second housing. 8. The system of claim 1, wherein the lubricant includes contaminants, and wherein the system further comprises: a filter coupled to the supply tube and configured to remove at least a portion of the contaminants from the lubricant. 9. The system of claim 1, wherein the lubricant includes contaminants, and wherein the system further comprises: a filter disposed within the second housing and in fluid communication with the supply tube to thereby remove at least a portion of the contaminants from the lubricant before the lubricant is received by the check valve. 10. The system of claim 9, wherein the filter is a plurality of shelves, each shelf configured to allow the contaminants in the lubricant to settle thereon. 11. The system of claim 1, wherein the lubricant includes contaminants, the system further comprising: a filter coupled to the return opening to thereby remove at least a portion of the contaminants from the lubricant. 12. An air turbine starter, comprising: a starter housing adapted to couple to a gearbox assembly, the starter housing including a supply opening and an exhaust opening, each configured to provide fluid communication between the gearbox assembly and the starter housing, wherein at least a portion of the gearbox assembly is at a first pressure and at least a portion of the starter housing is at a second pressure thereby generating a pressure differential therebetween; a lubricant supply tube disposed within the supply opening and configured to extend between the gearbox assembly and starter housing, the lubricant supply tube having an inlet configured to receive lubricant from the gearbox assembly and an outlet configured to deliver lubricant to the starter; a receptacle disposed within the starter housing and configured to receive lubricant supplied from the supply tube and to hold a predetermined volume of the lubricant; and a check valve coupled to the starter housing proximate the exhaust opening and configured to receive overflow lubricant from the receptacle, if the lubricant exceeds the predetermined volume, wherein the check valve is further configured to open or close the exhaust opening in response to the pressure differential between the starter housing and the gearbox assembly. 13. The air turbine starter of claim 12, further comprising: a shaft having a first portion disposed within the starter housing and a second portion extending from the starter housing, wherein the starter housing is axially mounted to the shaft; and an aperture formed in the second portion of the shaft. 14. The air turbine starter of claim 13, wherein the aperture is in communication with the first and the second environments and configured to respond to a pressure difference therebetween. 15. The air turbine starter of claim 12, further comprising: a flow regulator coupled to the supply tube and configured to regulate a rate at which the lubricant flows between the gearbox assembly and starter housing. 16. The air turbine starter of claim 15, wherein the flow regulator comprises at least one regulator orifice. 17. The air turbine starter of claim 12, wherein the exhaust opening is configured to receive the overflow lubricant from the check valve and provide an outlet for the overflow lubricant out of the starter. 18. The air turbine starter of claim 12, further comprising an intermediate environment disposed within an intermediate housing, the intermediate housing having a first side coupled to the starter and a second side configured to couple to the gearbox assembly. 19. The air turbine starter of claim 18, wherein the intermediate housing includes an inlet opening configured to substantially align with the exhaust opening of the starter housing. 20. The air turbine starter of claim 12, wherein the lubricant includes contaminants, and wherein the system further comprises: a filter coupled to the supply tube and configured to remove at least a portion of the contaminants from the lubricant. 21. The air turbine staffer of claim 12, wherein the lubricant includes contaminants, and wherein the system further comprises: a filter disposed within the staffer housing and in fluid communication with the supply tube to thereby remove at least a portion of the contaminants from the lubricant before the lubricant is received by the check valve. 22. The air turbine staffer of claim 12, wherein the lubricant includes contaminants, and wherein the system further comprises: a filter coupled to the exhaust opening to thereby remove at least a portion of the contaminants from the lubricant.