Epicyclic speed reducer designed for fitment to the transmission between the gas turbine and air compressor of an aircraft engine
First Claim
1. An epicyclic speed reducer designed for fitment to a transmission between a gas turbine and air compressor of an aircraft turbine engine, said reducer comprising a sun gear (5) connected to said turbine;
- a planet carrier (6) connected to said air compressor coaxially to said sun gear (5) and supporting a number of planetary gear (7) meshing with one of said sun gear (5); and
a ring gear (8) fitted to a mounting (9) of said engine and with which said planetary gear (7) mesh;
characterized by the fact that said planet carrier (6) comprising a first annular element (10) having a number of pairs of seats (11) for pins (13) on each of which rotates one of said planetary gears (7), and a number of holes (16) each interposed between two continuous planetary gears (7);
a second annular element (17) connected to said compressor and having a number of cantilever axial arms (18), each designed to fit inside one of said holes (16) on said first element (10);
connecting means (19) for connecting the end of each said cantilever axial arms (18) to a portion (20) of said first element (10), which portion (20) is substantially equidistant in relation to these seats (11) in each said pair of seats of said pins (13);
said connecting means comprising a hinge (19) having a proper axis which is positioned radially in relation to a reducer axis, and is equidistant in relation to the seats (11) in each said pair of seats of said pins (13).
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Accused Products
Abstract
A speed reducer has a sun gear for connection to a turbine of an engine and a planet carrier supporting a number of planetary gears meshing with the sun gear and with the ring gear fitted to the engine mounting. According to the present invention, the planet carrier has a first annular element having pairs of seats for pins on each of which rotates one of the planetary gears. A second annular element for connection to a compressor of the engine has a number of axial arms fitted inside respective cavities of the first annular element. An end of each axial arm is connected to a portion of the first annular element that is substantially equidistant between to the seats of each of the pairs of seats.
127 Citations
13 Claims
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1. An epicyclic speed reducer designed for fitment to a transmission between a gas turbine and air compressor of an aircraft turbine engine, said reducer comprising a sun gear (5) connected to said turbine;
- a planet carrier (6) connected to said air compressor coaxially to said sun gear (5) and supporting a number of planetary gear (7) meshing with one of said sun gear (5); and
a ring gear (8) fitted to a mounting (9) of said engine and with which said planetary gear (7) mesh;
characterized by the fact that said planet carrier (6) comprising a first annular element (10) having a number of pairs of seats (11) for pins (13) on each of which rotates one of said planetary gears (7), and a number of holes (16) each interposed between two continuous planetary gears (7);
a second annular element (17) connected to said compressor and having a number of cantilever axial arms (18), each designed to fit inside one of said holes (16) on said first element (10);
connecting means (19) for connecting the end of each said cantilever axial arms (18) to a portion (20) of said first element (10), which portion (20) is substantially equidistant in relation to these seats (11) in each said pair of seats of said pins (13);
said connecting means comprising a hinge (19) having a proper axis which is positioned radially in relation to a reducer axis, and is equidistant in relation to the seats (11) in each said pair of seats of said pins (13). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- a planet carrier (6) connected to said air compressor coaxially to said sun gear (5) and supporting a number of planetary gear (7) meshing with one of said sun gear (5); and
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13. A planet carrier for an epicyclic speed reducer between a gas turbine and air compressor of an aircraft turbine engine, said speed reducer having a sun gear (5) for connection to said gas turbine and a ring gear (8) for fitting to a mounting (9) of said engine, said planet carrier (6) being for connection to said air compressor coaxially of said sun gear (5) and for supporting planetary gears (7) meshing with said sun gear and said ring gear, said planet carrier (6) comprising:
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a first annular element (10) having an axis and pairs of seats (11) on axially opposite sides; pins (13) respectively in said seats for each pin to rotatably carry a planetary gear (7); holes (16) in said first annular element respectively interposed between each adjacent two of said planetary gears (7); a second annular element (17) for connection to a compressor and having a number of cantilever axial arms (18) respectively fitting inside said holes (16) with clearance; and connecting means (19) respectively connecting respective ends of said cantilever axial arms (18) to respective portions (20) of said first annular element (10) that are substantially equidistant between said seats (11) of respective of said pairs of seats, each said connecting means comprising a hinge (19) having an axis positioned radially in relation to said axis of said first annular element and equidistant said seats (11) of said respective of said pair of seats.
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Specification