초록 ▼

An aircraft gas turbine engine includes high and low pressure turbines having respective counter rotatable low pressure inner and outer rotors with low pressure inner and outer shafts in part rotatably disposed co-axially within a high pressure rotor and drivingly connected to first and second fan b

An aircraft gas turbine engine includes high and low pressure turbines having respective counter rotatable low pressure inner and outer rotors with low pressure inner and outer shafts in part rotatably disposed co-axially within a high pressure rotor and drivingly connected to first and second fan blade rows and first and second boosters respectively. A bypass duct radially bounded by a fan casing and an annular radially inner bypass duct wall surrounds the boosters axially located between the first and second fan blade rows. The engine has a high pressure compressor operable to produce an overall pressure ratio in a range of about 40-65 and a fan inlet hub to tip radius ratio in a range between 0.20 and 0.35, a bypass ratio in a range of 5-15, an operational fan pressure ratio in a range of 1.4-2.5, and a sum of operational fan tip speeds in a range of 1000 to 2500 feet per second.

대표청구항 ▼

An aircraft gas turbine engine includes high and low pressure turbines having respective counter rotatable low pressure inner and outer rotors with low pressure inner and outer shafts in part rotatably disposed co-axially within a high pressure rotor and drivingly connected to first and second fan b

An aircraft gas turbine engine includes high and low pressure turbines having respective counter rotatable low pressure inner and outer rotors with low pressure inner and outer shafts in part rotatably disposed co-axially within a high pressure rotor and drivingly connected to first and second fan blade rows and first and second boosters respectively. A bypass duct radially bounded by a fan casing and an annular radially inner bypass duct wall surrounds the boosters axially located between the first and second fan blade rows. The engine has a high pressure compressor operable to produce an overall pressure ratio in a range of about 40-65 and a fan inlet hub to tip radius ratio in a range between 0.20 and 0.35, a bypass ratio in a range of 5-15, an operational fan pressure ratio in a range of 1.4-2.5, and a sum of operational fan tip speeds in a range of 1000 to 2500 feet per second. reference member (31).7. A machine as claimed in claim 6, characterized in that said reference member (31) comprises optical reflecting means; and said reading system (32) comprises a laser emitter.8. A machine as claimed in claim 6, characterized in that said reference member (31) comprises generating means (31) for generating a magnetic field, in particular a permanent magnet; and said reading system (32) comprises a bar (33) of magnetostrictive material parallel to at least one portion of said guide (10) and facing said generating means (31).9. A machine as claimed in claim 6, characterized in that said reference member (31) comprises generating means (31) for generating a magnetic field, in particular a permanent magnet; and said reading system (32) comprises a bar (33) having magnetoresistors and located parallel to at least one portion of said guide (10) and facing said generating means (31).10. A machine as claimed in claim 1, characterized in that said conveyor (6) comprises timing means (36) for timing said carriage (8) along a given portion (P3) of said guide (10).11. A machine as claimed in claim 10, characterized by comprising a wrapping unit (5); and a transfer station located along said given portion (P3) of said guide (10) to transfer a said group (4) of cigarettes (2) from said pocket (9) to the wrapping unit (5).12. A machine as claimed in claim 10, characterized in that said timing means (36) comprise a further conveyor (38) having at least one connecting means (28,39) for establishing a connection between said carriage (8) and the further conveyor (38) to feed the carriage (8) and the further conveyor (38) forward substantially synchronously and in a given position with respect to each other.13. A machine as claimed in claim 12, characterized in that said connecting means (28,39) comprise first and second magnetic connecting means (28,39) located respectively on said carriage (8) and said further conveyor (38), and for mechanically connecting the carriage (8) and the further conveyor (38) to each other in response to a magnetic field generated by at least one of said connecting means (28,39).14. A machine as claimed in claim 13, characterized in that at least one of said first and second magnetic connecting means (28;39) comprises a permanent magnet (28,39).15. A machine as claimed in claim 13, characterized in that said first and second magnetic connecting means (28,39) each comprise a respective permanent magnet (28,39).16. A machine as claimed in claim 13, characterized in that said given portion (P3) of the guide (10) is a semicircular portion; said further conveyor (38) comprising at least one powered disk (38) coaxial with the semicircular said given portion (P3) and supporting a number of permanent magnets (39).17. A machine as claimed in claim 16, characterized in that said further conveyor (38) comprises two identical powered disks (38), each coaxial with the semicircular said given portion (P3) and supporting a number of permanent magnets (39); the two disks (38) being synchronous with each other, and being spaced axially apart to define, in between, a semicircular passage (41); said carriage (8) comprising a bottom portion, which engages said passage (41) and has at least one permanent magnet (28) which interacts with a magnetic field generated by a respective permanent magnet (39) carried by a said disk (38); and said permanent magnets (28,39) defining said first and second magnetic connecting means (28,39).18. A packing machine, in particular for packing cigarettes ( 2), comprising at least one pocket (9) for housing at least one article (4); and a conveyor (6) for feeding the pocket (9) along a path (P); the machine (1) being characterized in that the conveyor (6) comprises a carriage (8) running along said path (P) and supporting said pocket (9); and a linear electric motor (24) comprising a primary or stator (25) located along at least one portion of said path (P), and a secondary or cursor (26) carried by said carriage (8).19. A cigarette packing machine comprising a conveyor ( 6) having at least one pocket (9) for forming and conveying a respective group (4) of cigarettes (2); said conveyor (6) comprising a fixed guide (10), at least one carriage (8) running along said guide (10) and supporting said pocket (9), a linear electric motor (24) having a stator or primary (25) located along at least a portion of the guide (10), and a cursor or secondary (26) carried by said carriage (8), sensor means (30) for determining the position of said carriage (8) along at least one portion of said guide (10); said sensor means (30) comprising a reference member (31) carried by said carriage (8), and a fixed reading system (32) connected to said reference member (31); said reference member (31) comprising generating means (31) for generating a magnetic field, in particular a permanent magnet; and said reading system (32) comprising a bar (33) of magnetostrictive material parallel to at least one portion of said guide (10) and facing said generating means (31).20. A cigarette packing machine comprising a conveyor ( 6) having at least one pocket (9) for forming and conveying a respective group (4) of cigarettes (2); said conveyor (6) comprising a fixed guide (10), at least one carriage (8) running along said guide (10) and supporting said pocket (9), a linear electric motor (24) having a stator or primary (25) located along at least a portion of the guide (10), and a cursor or secondary (26) carried by said carriage (8), sensor means (30) for determining the position of said carriage (8) along at least one portion of said guide (10); said sensor means (30) comprising a reference member (31) carried by said carriage (8), and a fixed reading system (32) connected to said reference member (31); said reference member (31) comprising generating means (31) for generating a magnetic field, in particular a permanent magnet; and said reading system (32) comprising a bar (33) having magnetoresistors and located parallel to at least one portion of said guide (10) and facing said generating means (31).21. A cigarette packing machine comprising a conveyor ( 6) having at least one pocket (9) for forming and conveying a respective group (4) of cigarettes (2); said conveyor (6) comprising a fixed guide (10), at least one carriage (8) running along said guide (10) and supporting said pocket (9), a linear electric motor (24) having a stator or primary (25) located along at least a portion of the guide (10), and a cursor or secondary (26) carried by said carriage (8), and timing means (36) for timing said carriage (8) along a given portion (P3) of said guide (10); said timing means (36) comprising a further conveyor (38) having at least one connecting means (28,39) for establishing a connection between said carriage (8) and the further conveyor (38) to feed the carriage (8) and the further conveyor (38) forward substantially synchronously and in a given position with respect to each other; said connecting means (28,39) comprising first and second magnetic connecting means (28,39) located respectively on said carriage (8) and said further conveyor (38), and for mechanically connecting the carriage (8) and the further conveyor (38) to each other in response to a magnetic field generated by at least one of said connecting means (28,39); at least one of said first and second magnetic connecting means (28,39) comprising a permanent magnet (28,39); said given portion (P3) of the guide (10) being a semicircular portion; said further conveyor (38) comprising at least one powered disk (38) coaxial with the semicircular said given portion (P3) and supporting a number of permanent magnets (39); said further conveyor (38) comprising two identical powered disks (38), each coaxial with the semicircular said given portion (P3) and supporting a number of permanent magnets (39); the two disks (38) being synchronous with each other, and being spaced axially apart t