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In a multi-spool turbo machine, a first shaft of the low pressure spool is supported for rotation with respect to a second shaft of the high pressure spool and is located with respect to the second shaft by means of a roller bearing. Rollers of the bearing are inserted between an internal ring mount

In a multi-spool turbo machine, a first shaft of the low pressure spool is supported for rotation with respect to a second shaft of the high pressure spool and is located with respect to the second shaft by means of a roller bearing. Rollers of the bearing are inserted between an internal ring mounted on the second shaft and an outer ring mounted by a ring support assembly carried by the first shaft. The ring support assembly includes a ring support member which comprises, at its outer periphery, a first toothed element cooperating with a second toothed element carried by retaining means. The ring support member is held axially by a channel-section member.

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1. In a turbo-machine multi-spool inter-shaft bearing assembly comprising a first shaft of the low-pressure spool shaft line, a second shaft of the high-pressure spool shaft line located coaxially with the first shaft, journal bearing means including an internal ring rotatable with the second shaft,

1. In a turbo-machine multi-spool inter-shaft bearing assembly comprising a first shaft of the low-pressure spool shaft line, a second shaft of the high-pressure spool shaft line located coaxially with the first shaft, journal bearing means including an internal ring rotatable with the second shaft, an external ring mounted within a ring support assembly for rotation with the first shaft and roller bearing members operative between said internal and external rings, the improvement comprising a first toothed element, a second toothed element and, an intermediate part, said ring support assembly comprising said elements and said intermediate part, the toothed elements meshing with minimal clearance between meshing parts, and the intermediate part being secured for rotation with the first shaft, and a body of revolution having a cross-section that includes a substantially U-shaped channel section, serving to locate axially said ring-support assembly and being secured to the first shaft for rotation therewith, wherein the low pressure shaft further comprises a radial face and the first toothed element of the ring support assembly comprises a plurality of regularly-spaced teeth on its outer periphery, and the second toothed element comprises a plurality of paired parts, the outline of each pair of parts being capable of being inscribed within the volume of an imaginary right triangular prism of which one of the apices is replaced by a groove formed between adjacent teeth of said second toothed element, said groove having a width matched to the width of a corresponding tooth of said first toothed element, and wherein said bearing assembly further comprises means securing the plurality of paired parts of the said low pressure spool shaft against the said face of the low pressure shaft. 2. A bearing assembly according to claim 1 wherein said ring support assembly further comprises a ring support member for contacting and supporting said external ring, said body of revolution comprises means for positioning the ring support member by contacting it at the downstream side thereof, said low-pressure shaft comprises a substantially radial face, said body of revolution comprises a radial flange interposed between said radial face of the low-pressure shaft and the plurality of paired parts, and said ring support assembly further comprises: an annular retention member disposed upstream of the said body of revolution and defining with the body of revolution a toroidal enclosure for said plurality of paired parts, and securing means for securing the annular retention member, the plurality of paired parts, and the radial flange of the body of revolution to said radial face of the low-pressure shaft. 3. In a turbo-machine multi-spool inter-shaft bearing assembly comprising a first shaft of the low-pressure spool shaft line, a second shaft of the high-pressure spool shaft line located coaxially with the first shaft, journal bearing means including an internal ring rotatable with the second shaft, an external ring mounted within a ring support assembly for rotation with the first shaft and roller bearing members operative between said internal and external rings, the improvement comprising a first toothed element, a second toothed element and, an intermediate part, said ring support assembly comprising said elements and said intermediate part, the toothed elements meshing with minimal clearance between meshing parts, and the intermediate part being secured for rotation with the first shaft, and a body of revolution having a cross-section that includes a substantially U-shaped channel section, serving to locate axially said ring-support assembly and being secured to the first shaft for rotation therewith, wherein said ring support assembly further comprises a ring support member for contacting and supporting said external ring, said first toothed element comprises longitudinally-extending splines on the periphery of said ring support member, and the second toothed element comprises a cylindrical base member and an array of axially-extending splines meshing with the splines of the ring support member, said cylindrical base member being secured to the low-pressure shaft. 4. A bearing assembly according to claim 3, further comprising an annular member of the low-pressure spool shaft line, said low-pressure shaft comprising a radial face, means securing the annular member to the radial face of the low-pressure shaft, and the annular member having an internal diameter, the cylindrical base member being welded to said internal diameter. 5. A bearing assembly according to claim 4 wherein the body of revolution is welded to an upstream face of the ring support member and wherein said annular member comprises an annular radial flange, the bearing assembly further comprising means securing the body of revolution against said annular radial flange of the annular member.