摘要:
A disclosed fan drive gear system for a gas turbine engine includes a first fan shaft coupled to a second fan shaft, a first shaft support bearing assembly disposed about the first fan shaft and a second shaft support bearing assembly disposed about the second fan shaft. A planetary gear system is coupled to the second fan shaft. A transfer bearing is configured to receive lubricant from a lubricant input and is positioned between the first and second fan shaft support bearings. A second bearing is configured to rotate with the second fan shaft and receive lubricant from the transfer bearing and communicate lubricant to at least one lubricant passage and a conduit fluidly connecting the at least one lubricant passage to the planetary gear system.
摘要:
The present disclosure is directed to a sump housing (100) for a gas turbine engine (10). The sump housing (100) includes a base portion (118) and a first wall (128) extending outwardly from the base portion (118). The first wall (128) and the base portion (118) at least partially define an inner chamber (134). A second wall (130) is positioned outwardly from the first wall (128) and extends outwardly from the base portion (118). The base portion (118), the first wall (128), and the second wall (130) at least partially define an outer chamber (136) positioned outwardly from the inner chamber (134). A projection (132) extending inwardly from the first wall (128) engages a bearing assembly (52). The base portion (118), the first wall (128), the second wall (130), and the projection (132) are integrally coupled together.
摘要:
A counter-rotating shaft assembly 38 of a gas turbine engine 10 includes an outer shaft rotatable 32 in a first direction about a virtual rotational axis 34, an inner shaft 31 counter-rotatable about the virtual rotational axis 34 in a second direction that is opposite to the first direction, a differential bearing 50 rotatably connecting the two shafts 31, 32, a centering spring 70 connecting the inner shaft 31 to the differential bearing 50, and a squeeze film damper 60 between the differential bearing 50 and the inner shaft 31.
摘要:
A circumferential lubricant scoop (200) for providing lubricant to a bearing assembly. The scoop (200) is disposed circumferentially about and rotates with a rotor shaft (214). The scoop (200) comprises a plurality of lubricant capturing vanes (202) shaped to capture and retain lubricant supplied by a stationary oil jet (122) in a cavity behind a lower lip (212) of the vane (202). This cavity is in fluid communication with channels (208, 216, 218, 224, 226) leading to fluid pathways (108, 116, 118) of an inner race (106) of the bearing assembly. Fluid is moved through the channels (208, 216, 218, 224, 226) and fluid pathways (108, 116, 118) due to the rotational force imparted by the rotating rotor shaft (214).
摘要:
A heat exchanger array (54) includes a first row (60) of heat exchangers (60A, 60B), a second row (62) of heat exchangers (62A-62C), and side curtains (68). The first row heat exchangers (60A, 60B) are spaced apart to define first gaps. The second row heat exchangers (62A-62C) are spaced apart to define second gaps and are positioned downstream of and staggered from the first row heat exchangers (60A, 60B) such that the second row heat exchangers (62A-62C) are aligned with the first gaps and the first row heat exchangers (60A-60B) are aligned with the second gaps. Each side curtain (68) is in close proximity to a first row heat exchanger (60A, 60B) and a second row heat exchanger (62A-62C). The side curtains (68) define a neck region (N) upstream of and aligned with each first row heat exchanger (60A, 60B) and each second row heat exchanger (62A-62C). Each neck region (N) has a neck area that is less than a frontal area of the heat exchanger with which it is aligned.
摘要:
A lubrication circuit for a gas turbine engine includes a bearing compartment, an air inlet connected to the bearing compartment, a lubricant inlet, and a lubricant outlet. The air inlet fluidly connects the bearing compartment to an environment external to the compartment. The lubricant inlet and outlet are connected to the bearing compartment. A scavenge valve is operatively connected between the lubricant outlet and a scavenge pump that is responsive to bearing compartment pressure for controlling pres sure drop across the air inlet.
摘要:
La présente invention concerne un dispositif de lubrification de secours (1) à architecture simplifiée d'un système mécanique (10). Ledit dispositif de lubrification de secours (1) est muni d'un réservoir (2), d'un moyen de déclenchement (3), d'au moins une conduite (4) et d'au moins un moyen de distribution (5). Ledit réservoir (2) contient un liquide de lubrification et est agencé à l'intérieur dudit système mécanique (10) et au-dessus desdites conduites (4) et desdits moyens de distribution (5). Chaque moyen de distribution (5) comporte au moins un moyen de restriction (6) afin de limiter le débit dudit liquide de lubrification. Ledit liquide de lubrification est chauffé par ledit système mécanique (10) et la viscosité dudit liquide de lubrification diminue afin que le débit dudit liquide de lubrification au niveau de chaque moyen de distribution (5) soit sensiblement égal ou supérieur à un débit minimal tant que ledit réservoir contient dudit liquide de lubrification.
摘要:
Methods and systems for diagnosing a condition of an engine based on lubrication fluid analysis are disclosed. One embodiment of the methods comprises: receiving input data (128) representative of a respective geometric parameter and a respective chemical composition for a plurality of particles (124) filtered from a sample of fluid (126) obtained from the engine; generating data representative of a mass of material of a chemical composition category in one or more of the particles (124); comparing the mass of material of the chemical composition category with reference data (134); and generating output data (130) representative of a diagnosis of the condition of the engine.
摘要:
A system for managing thermal transfer in at least one of an aircraft or a gas turbine engine includes a first engine system 202 utilizing an oil for heat transfer. The oil of the first system has a temperature limit of at least about 500°F. The system additionally includes a fuel system 206 having a deoxygenation unit 212 for deoxygenating fuel in the fuel system 206, as well as a fuel-oil heat exchanger located downstream of the deoxygenation unit 212. The fuel-oil heat exchanger is in thermal communication with the oil in the first engine system 202 and the fuel in the fuel system 206 for transferring heat from the oil in the first engine system 202 to the fuel in the fuel system 206.