摘要:
A turbofan gas turbine propulsion engine includes a system to transfer power from the low pressure turbine to the high pressure turbine and/or extract additional load from the low pressure turbine during certain turbofan engine operational conditions. The systems include a hydrostatic power transfer system that includes a hydraulic pump and a hydraulic motor coupled to the low pressure and high pressure turbine, respectively. The systems additionally include a mechanical and electrical load shifting/loading sharing systems that use clutches and gear assemblies to share and/or shift load between the turbines.
摘要:
A rotary actuator includes one or more rotor vanes (40); an endplate (60); a corner seal (30) being positioned between the rotor vanes (40) and the endplate (60); a vane seal (20); a high pressure chamber and a low pressure chamber; and a single channel (22) extending from a lower portion of a vane seal groove (25) to a common channel (28) beneath the vane seal (20), wherein the high pressure chamber is in fluid communication with the corner seal (30) via the single channel (22) and the common channel (28). The common channel (28) may be formed in the rotor vane (40) or provided separately in a rotor vane flow sleeve (21) positioned along an interior surface of the rotor vane (40). The single channel (22) is machined from the bottom of the vane seal groove (25) to the area behind the corner seal (30). A second set of endplates (60), corner seal (30), single channel (26) and common channel (29) may be provided at an axially opposite end of the rotor vane (40) from the first set channels in each rotor vane (40).
摘要:
A method of manufacturing a wear resistant shoe (26) includes upsetting (46) one end portion (38) of cylindrical member to work harden that portion to a substantial depth, machining (48) the cylindrical member portion to finished dimensions and surface hardening (56) a face (28 or 34) of the machined cylindrical member portion. The cylindrical member may comprise rod stock of a diameter less than the greatest diameter of the finished shoe and be upset or swaged to axially reduce and radially increase the dimensions of the one end portion. A hollow region (30) is formed in an opposite rod stock end portion and the periphery (50) of the hollow region is crimped about a rounded end (18) of the piston (20). The cold work done during the swaging or forming process provides a foundation for hardened faces comprising balance (28) and auxiliary balance (34) lands, forms a crude shape of the shoe, and imparts work hardening and wear property improvements. The harder metal surface provides a foundation for subsequent surface hardening such as coating with TiN. The crimping process used to join the shoe to the piston imparts cold work to the skirt region of the shoe and enhances the wear resistance of the shoe. The cold heading step (46) may be omitted if a hardened rod stock is used, but the skirt should be annealed (66) prior to crimping to the piston.
摘要:
A fuel supply system includes a fuel metering pump and a servo-flow pump that are used to supply fuel to one or more fuel manifolds and one or more fluid-operated actuators, respectively. The fuel metering pump and the servo-flow pump are driven by the same electric motor(s).
摘要:
A disc brake includes a positioning device (40) which is pressure responsive to control the amount of retraction for a piston (22) within the disc brake. The positioning device includes a plug (44) movably and sealingly carried within the piston (22) and a pair of legs (48, 50). The plug (44) cooperates with the pair of legs (48, 50) to move the latter to a position in spaced relation to a caliper housing (12) when the pressure level within a pressure chamber (28) is above a predetermined value. A spring (52) cooperates with the plug (44) and the pair of legs (48, 50) to engage the latter with the caliper housing (12) when the fluid pressure within the pressure chamber (28) is below the predetermined value.
摘要:
A floating-caliper disc brake (10) includes a non-rotating torque member (36) which carries the caliper (22) in fixed radial position relative to the disc (12) via a pair of resilient assemblies (50). The torque member and caliper each have matching grooves (44, 46) which, when placed in registry, define a pair of apertures (48) between the caliper and the arms (38, 40) of the torque member. The resilient assemblies are received in the apertures (48) so as to yieldably space apart the caliper and the torque member. Brake torque is transferred from the caliper to the torque member by abutment surfaces defined on the caliper and on the torque member. The resilient assemblies provide for ready axial movement of the caliper relative to the torque member in the brake release condition by providing a light spring force which centers the caliper between the arms of the torque member. A much larger spring force is provided by the resilient assemblies if the caliper moves to either side of the caliper-centered position so that the caliper does not rattle against the torque member arms incident to vibrations and road shocks caused by vehicle operation.
摘要:
A fuel supply system includes a fuel metering pump and a servo-flow pump that are used to supply fuel to one or more fuel manifolds and one or more fluid-operated actuators, respectively. The fuel metering pump and the servo-flow pump are driven by the same electric motor(s).
摘要:
A direct metering fuel supply system includes a plurality of axial gap motors, a fixed displacement, variable speed positive displacement piston pump, and a gas turbine engine control. Each axial gap motor is configured to be selectively energized and is operable, upon being energized, to supply a drive torque at a drive speed. The fixed displacement, variable speed positive displacement piston pump is coupled to each of the axial gap motors to receive the drive torque selectively supplied therefrom and is operable, upon receipt of the drive torque, to supply fuel at a flow rate dependent on the drive speed. The gas turbine engine control is adapted to receive fuel flow commands and is operable, in response to the fuel flow commands, to energize one of the plurality of axial gap motors.
摘要:
A disc brake assembly includes a caliper assembly which is operable to bias a pair of friction elements into engagement with a rotor. At least one resilient member cooperates with the caliper assembly and the pair of friction elements to releasably couple the latter to the caliper assembly. In addition, the one resilient member cooperates with the caliper assembly and one of the pair of friction elements to define an interlocking fit preventing movement of the caliper assembly in a radial direction relative to the rotor.
摘要:
A fuel metering system for supplying fuel to a plurality of loads includes a variable displacement piston pump having an adjustable hanger that is movable to a plurality of positions. The variable displacement piston pump is configured to receive a drive torque and, upon receipt of the drive torque, to supply fuel to the plurality of loads at a flow rate dependent on the position of the adjustable hanger. A hanger actuator is coupled to receive hanger position commands and is operable, in response thereto, to move the adjustable hanger to the commanded position. A pump control mechanism is coupled to receive the fuel flow commands supplied by the gas turbine engine controller and is operable, in response thereto, to supply the hanger position commands.