Kish Jules G. (Milford CT) Sammataro Stephen R. (Norwalk CT) Isabelle Charles J. (Winsted CT)
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United Technologies Corporation (Hartford CT 02)
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26인용 특허 :
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초록▼
A self-scavenging, hybrid lubrication subsystem for a main transmission gearbox includes a sump fabricated as an integral extension of the lower portion of the gearbox wherein the sump dynamic fluid level is above the gearbox bottom. The interior sidewall of the lower gearbox is modified to include
A self-scavenging, hybrid lubrication subsystem for a main transmission gearbox includes a sump fabricated as an integral extension of the lower portion of the gearbox wherein the sump dynamic fluid level is above the gearbox bottom. The interior sidewall of the lower gearbox is modified to include a cylindrical segment having a first radius, a throat segment having a second radius, and a transition segment contiguous with the cylindrical and throat segments. The radial discontinuity between the cylindrical and throat segments defines a nozzle inlet that directs the outflow of lubricating medium in the gearbox bottom to the sump via a nozzle. The outflow end of the nozzle is positioned above the sump dynamic fluid level. Housed within the lower gearbox is a planetary gear train that includes an annular planetary carrier plate having a deflection plate mounted thereto. The periphery of the carrier plate and the cylindrical and throat segments in combination form primary and restricted flow channels. Interaction between the deflection plate and the gearbox bottom exerts a viscous pumping action on the lubricating medium in the gearbox bottom causing it to flow outwardly into the primary and restricted flow channels. Interaction between the periphery of the rotating carrier plate and the structurally-modified sidewall exerts a viscous pumping action on the lubricating medium in the flow channels causing it to flow therethrough. Substantially all of the lubricating medium flowing through the primary flow channel is diverted through the nozzle to the sump.
대표청구항▼
A self-scavenging, hybrid lubrication subsystem for a main transmission gearbox that includes a lower portion having a planetary gearing system operationally housed therein, the lower portion of the main transmission gearbox being defined by a bottom wall and a side wall, said self-scavenging, hybri
A self-scavenging, hybrid lubrication subsystem for a main transmission gearbox that includes a lower portion having a planetary gearing system operationally housed therein, the lower portion of the main transmission gearbox being defined by a bottom wall and a side wall, said self-scavenging, hybrid lubrication subsystem comprising: a sump containing lubricating medium that defines a dynamic fluid level, said sump being fabricated as an integral structural extension of the lower portion of the main transmission gearbox so that the dynamic fluid level of the lubricating medium in said sump is a predetermined height above the bottom wall of the main transmission gearbox; the side wall of the lower portion of the main transmission gearbox being structurally modified to include a cylindrical segment defined by a first predetermined radius, a transition segment contiguous with said cylindrical segment, a throat segment defined by a second predetermined radius, said first predetermined radius being greater than said second predetermined radius wherein a radial discontinuity is defined therebetween, and a nozzle inlet defined by the radial discontinuity between said cylindrical segment and said throat segment, the inner and outer walls defining said nozzle inlet being tangent to said throat and cylindrical segments, respectively; a nozzle having an intake end and an outflow end, said intake end being defined by said nozzle inlet and said outflow end being positioned in said sump so that said outflow end is above the dynamic fluid level of said sump; the planetary gear train including an annular planetary carrier plate having a peripheral surface defined by a predetermined radius, said annular planetary carrier plate being subjected to rotational motion during operation of the planetary gear train; said peripheral surface of said annular planetary carrier plate and said cylindrical and throat segments of said structurally-modified side wall in combination forming primary and restricted flow channels defined by first and second gaps having first and second radial dimensions, respectively; and a deflection plate mounted in combination with said annular planetary carrier plate to define a third gap having a vertical dimension between said deflection plate and the bottom wall of the main transmission gearbox; interaction between said deflection plate and the bottom wall of the main transmission gearbox exerting a viscous pumping action on lubricating medium collected in the bottom of the main transmission gearbox that imparts a rotational and centrifugal velocity to the lubricating medium that causes the lubricating medium to flow outwardly into said primary and restrictive flow channels; interaction between said peripheral surface of said rotating annular planetary carrier plate and said structurally-modified side wall exerting a viscous pumping action on the lubricating medium in said primary and restrictive flow channels to cause the lubricating medium to flow therethrough; and wherein substantially all of the lubricating medium flowing in said primary flow channel is diverted through said nozzle inlet and transported through said nozzle to said sump. A self-scavenging, hybrid lubrication subsystem for a helicopter main transmission gearbox that includes an upper portion and a lower portion having a planetary gearing system operationally housed therein, the lower portion of the main transmission gearbox being defined by a bottom wall and a side wall, said self-scavenging, hybrid lubrication subsystem comprising: a sump containing lubricating medium that defines a dynamic fluid level, said sump being fabricated as an integral structural extension of the lower portion of the main transmission gearbox so that the dynamic fluid level of the lubricating medium in said sump is a predetermined height above the bottom wall of the main transmission gearbox; the side wall of the lower portion of the main transmission gearbox being structurally modified to include a cylindrical segment defined by a first predetermined radius, a transition segment contiguous with said cylindrical segment, a throat segment defined by a second predetermined radius, said first predetermined radius being greater than said second predetermined radius wherein a radial discontinuity is defined therebetween, and a nozzle inlet defined by the radial discontinuity between said cylindrical segment and said throat segment; a nozzle having an intake end and an outflow end, said intake end being defined by said nozzle inlet and said outflow end being positioned in said sump so that said outflow end is above the dynamic fluid level of said sump; wherein the planetary gear train is a stacked compound planetary gear train that includes a driving sun gear, a plurality N of stacked primary planetary pinions functionally interacting with said driving sun gear, said plurality N of stacked primary planetary pinions including a first plurality N/2 of upper primary planetary pinions, and a second plurality N/2 of lower primary planetary pinions, and wherein said upper and lower primary planetary pinions are disposed in a staggered, biplanar relationship, a plurality N of secondary planetary pinions, a compound drive shaft supporting a respective primary planetary pinion and a secondary planetary pinion, a fixed ring gear interacting with said plurality of secondary planetary pinions, and a planetary carrier assembly disposed in rotatable combination with said compound drive shafts, said planetary carrier assembly including an annular planetary carrier plate having a peripheral surface defined by a predetermined radius, and wherein said annular planetary carrier plate is subjected to rotational motion during operation of said stacked compound planetary gear train; said peripheral surface of said annular planetary carrier plate and said cylindrical and throat segments of said structurally-modified side wall in combination forming primary and restricted flow channels defined by first and second gaps having first and second radial dimensions, respectively; a deflection plate mounted in combination with said annular planetary carrier plate to define a third gap having a vertical dimension between said deflection plate and the bottom wall of the main transmission gearbox; interaction between said rotating deflection plate and the bottom wall of the main transmission gearbox exerting a viscous pumping action on lubricating medium collected in the bottom of the main transmission gearbox that imparts a rotational and centrifugal velocity to the lubricating medium that causes the lubricating medium to flow outwardly into said primary and restrictive flow channels; interaction between said peripheral surface of said rotating annular planetary carrier plate and said structurally-modified side wall exerting a viscous pumping action on the lubricating medium in said primary and restrictive flow channels to cause the lubricating medium to flow therethrough; and wherein substantially all of the lubricating medium flow through said primary flow channel is diverted through said nozzle inlet and transported through said nozzle to said sump; and means for recirculating lubricating medium in said sump to the main transmission gearbox.
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