A segmented intershaft seal assembly for counter-rotating and co-rotating turbine engines is described. The assembly includes a pair of end rings, an annular seal element, and at least one resilient element. At least one end ring has a flange that extends from one side thereof. The flange has a lowe
A segmented intershaft seal assembly for counter-rotating and co-rotating turbine engines is described. The assembly includes a pair of end rings, an annular seal element, and at least one resilient element. At least one end ring has a flange that extends from one side thereof. The flange has a lower annular surface. The seal element includes at least two seal segments. Each seal segment includes a ring segment and a ring flange segment. The ring segment has an upper radial surface. The ring flange segment directly contacts and extends from the upper radial surface forming either a substantially “T”-shaped or “L”-shaped cross section. The seal segments are disposed between the end rings. At least one resilient element biases each seal segment away from the inner shaft so that the upper radial surface contacts the lower annular surface and a portion of the ring flange segment extends beyond the flanges.
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1. A segmented intershaft seal assembly for use between an inner shaft and an outer shaft disposed about a common axis within a turbine engine comprising: (a) a pair of end rings with at least one said end ring having a flange disposed along and extending from one side of said end ring, each said fl
1. A segmented intershaft seal assembly for use between an inner shaft and an outer shaft disposed about a common axis within a turbine engine comprising: (a) a pair of end rings with at least one said end ring having a flange disposed along and extending from one side of said end ring, each said flange has a lower annular surface;(b) an annular seal element formed by at least two seal segments, each said seal segment includes a ring segment and a ring flange segment, said ring segment has an upper radial surface, said ring flange segment disposed along and extending from said upper radial surface to form either a substantially “T”-shaped cross section or a substantially “L”-shaped cross section, said seal segments disposed between said end rings;(c) a spacer ring disposed between said end rings, said spacer ring disposed about and directly contacts said inner shaft;(d) an annular gap disposed between said spacer ring and said annular seal element; and(e) a plurality of resilient elements which completely traverse said annular gap, a first end of each said resilient element contacts said spacer ring, a second end of each said resilient element contacts said annular seal element, each said resilient element partially recessed within said annular seal element or said spacer ring, at least one said resilient element biases each said seal segment toward a sealing surface along said outer shaft so that said upper radial surface directly contacts said lower annular surface and a portion of said ring flange segment extends beyond said flange in direction of said outer shaft, said resilient elements separately minimize a clearance between each said seal segment and said sealing surface, a relief disposed circumferentially along said lower annular surface where said flange extends from said end ring. 2. The segmented intershaft seal assembly of claim 1, wherein each said resilient element is a compression spring disposed radially outward between said inner shaft and said outer shaft. 3. The segmented intershaft seal assembly of claim 2, further comprising: (f) a pin secured to said spacer ring adjacent to each said seal segment, said pin resides within an oversized cavity along said seal segment, said pin physically separated from said seal segment within said oversized cavity by a gap. 4. The segmented intershaft seal assembly of claim 2, wherein said spacer ring is secured to said end rings. 5. The segmented intershaft seal assembly of claim 2, further comprising: (f) a pin secured to one said end ring adjacent to each said seal segment, said pin partially resides within a cavity shaped or sized to form a gap physically separating said pin from said seal segment. 6. The segmented intershaft seal assembly of claim 1, wherein each said resilient element is a flat spring, each said flat spring partially recessed within a notch along said spacer ring, each said notch includes a pair of opposed corners, said flat spring positioned within said notch so that a pair of opposed ends along said flat spring separately contact said opposed corners. 7. The segmented intershaft seal assembly of claim 6, further comprising: (f) a pin secured to said spacer ring adjacent to each said seal segment, said pin resides within an oversized cavity along said seal segment, said pin physically separated from said seal segment within said oversized cavity by a gap. 8. The segmented intershaft seal assembly of claim 6, wherein said spacer ring is secured to said end rings. 9. The segmented intershaft seal assembly of claim 6, further comprising: (f) a pin secured to one said end ring adjacent to each said seal segment, said pin partially resides within a cavity shaped or sized to form a gap physically separating said pin from said seal segment. 10. The segmented intershaft seal assembly of claim 1, wherein each said ring flange segment has a shaped surface adjacent to said outer shaft. 11. The segmented intershaft seal assembly of claim 1, further comprising: (f) a locking nut directly contacting one said end ring to secure said seal assembly to said inner shaft. 12. The segmented intershaft seal assembly of claim 1, wherein said seal segments are composed of a metal, a metal alloy, or carbon,said end rings, said inner shaft, and said outer shaft have substantially similar thermal expansion properties to minimize contact between said seal segments and said outer shaft. 13. A segmented intershaft seal assembly for use between an inner shaft and an outer shaft disposed about a common axis within a turbine engine comprising: (a) a pair of end rings with at least one said end ring having a flange disposed along and extending from one side of said end ring, each said flange has a lower annular surface;(b) an annular seal element formed by at least two seal segments, each said seal segment includes a ring segment and a ring flange segment, said ring segment has an upper radial surface, said ring flange segment disposed along and extending from said upper radial surface to form either a substantially “T”-shaped cross section or a substantially “L”-shaped cross section, said seal segments disposed between said end rings;(c) a spacer ring disposed between said end rings, said spacer ring disposed about and directly contacts said inner shaft;(d) an annular gap disposed between said spacer ring and said annular seal element; and(e) an extension spring partially recessed within a groove along said seal segments between said annular seal element and said spacer ring, said extension spring biases each said seal segment toward a sealing surface along said outer shaft so that said upper radial surface directly contacts said lower annular surface and a portion of said ring flange segment extends beyond said flange in direction of said outer shaft, said extension spring minimizes a clearance between each said seal segment and said sealing surface, a relief disposed circumferentially along said lower annular surface where said flange extends from said end ring. 14. A segmented intershaft seal assembly for use between an inner shaft and an outer shaft disposed about a common axis within a turbine engine comprising: (a) a pair of end rings with at least one said end ring having a flange disposed along and extending from one side of said end ring, each said flange has a lower annular surface;(b) an annular seal element formed by at least two seal segments, each said seal segment includes a ring segment and a ring flange segment, said ring segment has an upper radial surface, said ring flange segment disposed along and extending from said upper radial surface to form either a substantially “T”-shaped cross section or a substantially “L”-shaped cross section, said seal segments disposed between said end rings;(c) a spacer ring disposed between said end rings, said spacer ring disposed about and directly contacts said inner shaft;(d) an annular gap disposed between said spacer ring and said annular seal element; and(e) a plurality of flat springs disposed between said annular seal element and said spacer ring, each said flat spring partially recessed within a notch disposed along a circumferential surface of said spacer ring, each said notch includes a pair of opposed corners, a pair of opposed ends along said flat spring separately contact said opposed corners, a middle portion of each said flat spring contacts one said seal segment, each said flat spring oriented to deflect inward and outward along a plane through said common axis and perpendicular to said spacer ring and said annular seal element, said flat springs bias said seal segments toward a sealing surface along said outer shaft so that said upper radial surface directly contacts said lower annular surface and a portion of said ring flange segment extends beyond said flange in direction of said outer shaft, said flat springs separately minimize a clearance between each said seal segment and said sealing surface along said outer shaft. 15. The segmented intershaft seal assembly of claim 14, further comprising: (f) a pin secured to said spacer ring adjacent to each said seal segment, said pin resides within an oversized cavity along said seal segment, said pin physically separated from said seal segment within said oversized cavity by a gap. 16. The segmented intershaft seal assembly of claim 14, wherein said spacer ring is secured to said end rings. 17. The segmented intershaft seal assembly of claim 14, further comprising: (f) a pin secured to one said end ring adjacent to each said seal segment, said pin partially resides within a cavity shaped or sized to form a gap physically separating said pin from one said seal segment. 18. A segmented intershaft seal assembly for use between an inner shaft and an outer shaft disposed about a common axis within a turbine engine comprising: (a) a pair of end rings with at least one said end ring having a flange disposed along and extending from one side of said end ring, each said flange has a lower annular surface;(b) an annular seal element formed by at least two seal segments, each said seal segment includes a ring segment and a ring flange segment, said ring segment has an upper radial surface, said ring flange segment disposed along and extending from said upper radial surface to form either a substantially “T”-shaped cross section or a substantially “L”-shaped cross section, said seal segments disposed between said end rings;(c) a spacer ring disposed between said end rings, said spacer ring disposed about and directly contacts said inner shaft;(d) an annular gap disposed between said spacer ring and said annular seal element;(e) a plurality of resilient elements which completely traverse said annular gap, a first end of each said resilient element contacts said spacer ring, a second end of each said resilient element contacts said annular seal element, at least one said resilient element biases each said seal segment toward a sealing surface along said outer shaft so that said upper radial surface directly contacts said lower annular surface and a portion of said ring flange segment extends beyond said flange in direction of said outer shaft, said resilient elements separately minimize a clearance between each said seal segment and said sealing surface; and(f) a pin secured to one said spacer ring adjacent to each said seal segment, said pin resides within an oversized cavity along said seal segment, said pin physically separated from said seal segment within said oversized cavity by a gap, said pin radially aligned with said resilient element when one said resilient element contacts said seal segment or disposed substantially equidistant from two said resilient elements when two said resilient elements contact said seal segment. 19. The segmented intershaft seal assembly of claim 18, wherein said spacer ring is secured to said end rings. 20. The segmented intershaft seal assembly of claim 18, further comprising: (g) a pin secured to one said end ring adjacent to each said seal segment, said pin partially resides within a cavity shaped or sized to form a gap physically separating said pin from said seal segment. 21. The segmented intershaft seal assembly of claim 13, further comprising: (f) a pin secured to said spacer ring adjacent to each said seal segment, said pin resides within an oversized cavity along said seal segment, said pin physically separated from said seal segment within said oversized cavity by a gap. 22. The segmented intershaft seal assembly of claim 13, wherein said spacer ring is secured to said end rings. 23. The segmented intershaft seal assembly of claim 13, further comprising: (f) a pin secured to one said end ring adjacent to each said seal segment, said pin partially resides within a cavity shaped or sized to form a gap physically separating said pin from said seal segment.
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