초록 ▼

A Positive Fluid Displacement Device (PFDD) with single piece double-ended pistons connected to a crankpin for circular motion. Pistons are nested together to maintain all pistons in the same plane perpendicular to the axis of the crankshaft. Cylinders are driven in a reciprocating fashion by the pi

A Positive Fluid Displacement Device (PFDD) with single piece double-ended pistons connected to a crankpin for circular motion. Pistons are nested together to maintain all pistons in the same plane perpendicular to the axis of the crankshaft. Cylinders are driven in a reciprocating fashion by the pistons and are held loosely in a cylinder carriage along its axis with radial sealing engagement therebetween. Pliable members mount port plates within a housing such that there is no direct contact therebetween or with a two-layer manifold. A flat surface of the port plate is urged against the cylinder head by a pliable member which exerts a force on the center of the port plate. Grooves in the first layer of the manifold are sealed by the second layer to form fluid passageways. The cylinder head is guided in housing grooves with a pliable member. A sealing lip is integral with a piston head.

대표청구항 ▼

A Positive Fluid Displacement Device (PFDD) with single piece double-ended pistons connected to a crankpin for circular motion. Pistons are nested together to maintain all pistons in the same plane perpendicular to the axis of the crankshaft. Cylinders are driven in a reciprocating fashion by the pi

A Positive Fluid Displacement Device (PFDD) with single piece double-ended pistons connected to a crankpin for circular motion. Pistons are nested together to maintain all pistons in the same plane perpendicular to the axis of the crankshaft. Cylinders are driven in a reciprocating fashion by the pistons and are held loosely in a cylinder carriage along its axis with radial sealing engagement therebetween. Pliable members mount port plates within a housing such that there is no direct contact therebetween or with a two-layer manifold. A flat surface of the port plate is urged against the cylinder head by a pliable member which exerts a force on the center of the port plate. Grooves in the first layer of the manifold are sealed by the second layer to form fluid passageways. The cylinder head is guided in housing grooves with a pliable member. A sealing lip is integral with a piston head. ion along a longitudinal axis of the feed screw to enhance consistency in material flow through the cartridge. The feed screw is preferably driven by a closed-loop servo motor to achieve high-performance dispensing resolution. The assembly is preferably compatible with fixed-z and floating-z cartridges. the step of securing the blades to the rim by fillet welds or friction welds to produce a rim surface having a shape including a compound radius. 8. A method in accordance with claim 1 wherein the outer rim includes an inner surface, said method comprising the step of: providing an inner surface of the outer rim with a shape that defines at least one apex within the outer rim, and that reduces circumferential rim stress concentration between each of the blades and the rim. 9. A gas turbine engine rotor assembly comprising a rotor comprising a radially outer rim, a radially inner hub, and a web extending therebetween, a plurality of circumferentially spaced apart rotor blades extending radially outwardly from said rim, an outer surface of said outer rim having a shape including a compound radius which defines at least one apex within said outer rim outer surface, and which reduces circumferential rim stress concentration between each of said blades and said rim. 10. A gas turbine engine rotor assembly in accordance with claim 9 wherein said outer rim surface has a circumferentially concave shape between adjacent blades. 11. A gas turbine engine in accordance with claim 9 wherein said rotor comprises a plurality of blisks. 12. A gas turbine engine in accordance with claim 9 wherein said outer rim shape directs air flow away from an interface between each of said blades and said rim. 13. A gas turbine engine in accordance with claim 9 wherein said outer surface of said outer rim comprises a compound radius. 14. A gas turbine engine in accordance with claim 13 wherein said compound radius comprises a first radius and a second radius, said first radius is between approximately 0.04 inches and 0.5 inches. 15. A gas turbine engine in accordance with claim 13 wherein said second radius is approximately 2 to 10 times a distance between said circumferentially spaced apart rotor blades. 16. A gas turbine engine rotor assembly comprising a first rotor and a second rotor, said first rotor coupled to said second rotor, at least one of said rotor comprising a radially outer rim, a radially inner hub, and a web extending therebetween, a plurality of circumferentially spaced apart rotor blades extending radially outwardly from said rim, an outer surface of said outer rim comprising a compound radius which reduces circumferential rim stress concentration between each of said blades and said rim. 17. A gas turbine engine rotor assembly in accordance with claim 16 wherein said outer rim surface of said one rotor has a concave shape between adjacent blades. 18. A gas turbine engine in accordance with claim 16 wherein said at least one of said rotor comprises a plurality of blisks. 19. A gas turbine engine in accordance with claim 16 wherein said outer surface of said outer rim comprises a first radius and a second radius. 20. A gas turbine engine in accordance with claim 19 wherein said first radius is between approximately 0.04 inches and 0.5 inches, said second radius is approximately 2 to 10 times a distance between said circumferentially spaced apart rotor blades. 20000400, Horng, 417/354; US-6249505, 20010600, Miyamoto et al., 369/266 dition. 6. The valve pitch propeller system of claim 5 further including a mass mounted for selective introduction into said flyweight assembly and a positioning linkage movable by said double acting piston and operative in the presence of a propeller low pitch condition to introduce said mass into said flyweight assembly. 7. The valve pitch propeller system of claim 1 wherein said actuator and said first stream control valve include a piston valve having a piston surface hydraulically connected to said metering valve to receive said first stream when said metering valve is moved to a predetermined position by said flyweight assembly and a valve surface for halting flow of said first stream to said double acting piston when said metering valve is moved to said predetermined position by said flyweight assembly. 8. The valve pitch propeller system of claim 1 wherein said metering valve is a spool valve and said metering valve member is a spool having opposite ends, said first biasing element and said flyweight assembly being connected to one of said spool ends and said second biasing element being connected to the other of said spool ends. 9. The valve pitch propeller system of claim 1 wherein said actuator and said first stream control valve include a piston valve having a piston surface hydraulically connected to said metering valve to receive said first stream when said metering valve is moved to a predetermined position by said flyweight assembly and a valve surface for halting flow of said first stream to said double acting piston when said metering valve is moved to said predetermined position by said flyweight assembly, said second biasing element including a spring interposed between said piston valve and said other spool end. 10. The valve pitch propeller system of claim 2 further including a reverse enabling valve hydraulically interposed between said actuator piston and said metering valve and operable to prevent said first stream from being applied to said actuator piston side. 11. The valve pitch propeller system of claim 10 wherein said reverse enabling valve is a hydraulically operated valve responsive to a hydraulic signal. 12. The valve pitch propeller system of claim 2 further including a hydraulic discharge path in fluid communication with said double acting piston one side, a flow limiter in said discharge path, and a valve operated bypass about said flow limiter. 13. The valve pitch propeller system of claim 12 wherein said flow limiter is an orifice. 14. The valve pitch propeller system of claim 12 wherein said valve operated bypass includes a hydraulically operated pitch delay valve connected to said transfer bearing to receive said second stream. 15. A variable pitch propeller system comprising: a rotatable propeller hub adapted to be driven by a prime mover; a double acting piston carried by said hub; propeller blades having shanks journaled on said hub; a linkage connecting said piston to said shanks so that movement of said piston will cause rotation of said shanks within said hub to change the pitch of said propeller blades between fine pitch and coarse pitch positions; a transfer bearing for providing fine pitch and coarse pitch streams of hydraulic fluid under pressure, said fine pitch stream adapted to be applied to a fine pitch side of said piston and said coarse pitch stream being adapted to be applied to a coarse pitch side of said piston; a main control for regulating the pressures of said fine pitch and coarse pitch streams to set the pitch of said blades on said hub; and a backup governing system carried by said hub and hydraulically interposed between said main control and said piston and including a spool valve including a spool movable between a plurality of metering positions, first and second, opposing biasing elements applying oppositely directed biasing forces to said valve member, a flyweight assembly connected to said spool applying a speed dependent valve positioning force