초록 ▼

A device for centering and guiding rotation of a turbine engine shaft. The device includes a roller bearing and a ball bearing mounted around the shaft and carried respectively by first and second flexible annular supports, together with an oil film compression damper having a rigid annular support

A device for centering and guiding rotation of a turbine engine shaft. The device includes a roller bearing and a ball bearing mounted around the shaft and carried respectively by first and second flexible annular supports, together with an oil film compression damper having a rigid annular support arranged around the roller bearing, the supports of the ball bearing and of the damper, and the roller bearing being stacked transversely, extending one around another.

대표청구항 ▼

1. A device for centering and guiding rotation of a turbine engine shaft having an axis, the device comprising: a roller bearing axially mounted around the shaft and carried by a first annular support;a ball bearing axially mounted around the shaft and carried by a second annular support; andan oil

1. A device for centering and guiding rotation of a turbine engine shaft having an axis, the device comprising: a roller bearing axially mounted around the shaft and carried by a first annular support;a ball bearing axially mounted around the shaft and carried by a second annular support; andan oil film compression damper axially arranged around the roller bearing and including an oil-filled annular space defined by a rigid annular support surrounding a portion of the first annular support,the first annular support and second annular support configured to be fastened with the annular support of the damper to a casing of the turbine engine, with each of the first annular support and second annular support including an elastically deformable annular portion,wherein the second annular support and the rigid annulars support surround the roller bearing. 2. A device according to claim 1, wherein the annular support of the damper is substantially L-shaped and comprises a cylindrical portion surrounding the first annular support and a radial portion for fastening to the casing. 3. A device according to claim 1, wherein the deformable portion of each bearing support includes through slots regularly distributed axially around the first annular support and the second annular support, the slots defining elastically deformable columns or tongues between one another. 4. A device according to claim 3, wherein the columns or tongues of the first annular support are substantially C-shaped or substantially hairpin-shaped. 5. A device according to claim 3, wherein the columns or tongues of the second annular support are substantially rectilinear and longitudinally oriented. 6. A device according to claim 5, wherein the columns or tongues of the second annular support have at least one end of greater width, and are substantially T-shaped or I-shaped. 7. A device according to claim 3, wherein the annular support of the damper includes longitudinal reinforcing splines projecting from an outer cylindrical surface thereof and configured, in the assembled position, to be engaged in slots of the second annular support. 8. A device according to claim 7, wherein the annular support of the damper includes means for feeding the damper with oil, including at least one duct formed in one of the reinforcing splines of the support. 9. A device according to claim 8, wherein the duct is connected to an endpiece for connection to oil delivery means, the endpiece projecting from a radial face of the support of the damper and configured, in the assembled position, to be engaged in one of the slots of the first annular support. 10. A device according to claim 1, wherein a portion of the first annular support that is arranged between the damper and the roller bearing has an I-shaped section and includes an inner cylindrical wall forming an outer ring of the roller bearing and an outer cylindrical wall with annular grooves formed in an outer surface thereof for housing sealing rings of the damper. 11. A device according to claim 1, wherein the second annular support is formed integrally with an outer ring of the ball bearing. 12. A turbine engine, or an airplane turboprop or turbojet, comprising: at least one device according to claim 1,wherein the first annular support and the second annular support and the damper are fasten to an annular flange of the casing of the turbine engine, the annular flange being situated in a plane transverse to said axis, essentially containing the damper and the roller bearing. 13. A turbine engine according to claim 12, wherein the flange of the casing is an interference fit on longitudinal reinforcing splines of the annular support of the damper. 14. A device according to claim 1, wherein the second annular support surrounds the rigid annular support which surrounds the roller bearing. 15. A device for centering and guiding rotation of a turbine engine shaft having an axis, the device comprising: a roller bearing axially mounted around the shaft and carried by a first annular support;a bail bearing axially mounted around the shaft and carried by a second annular support; andan oil film compression damper axially arranged around the roller bearing and including an oil-filled annular space defined by a rigid annular support surrounding a portion of the first annular support,the first annular support and second annular support configured to be fastened with the annular support of the damper to a casing, with each of the first annular support and second annular support including an elastically deformable annular portion,wherein the second annular support, the rigid annular support of the damper, and the roller bearing are stacked around one another transversely to said axis, so that the second annular support and the rigid annular support surround the tier bearing,wherein the deformable portion of each bearing support includes through slots regularly distributed around the first annular support and second annular support, the slots defining elastically deformable columns or tongues between one another, andwherein the annular support of the damper includes longitudinal reinforcing splines projecting from an outer cylindrical surface thereof and configured, in the assembled position, to be engaged in slots of the second annular support. 16. A device according to claim 15, wherein the annular support of the damper includes means for feeding the damper with oil including at least one duct formed in one of reinforcing splines of the support. 17. A device according to claim 15, wherein the second annular support surrounds the rigid annular support which surrounds the roller bearing. 18. A turbine engine, or an airplane turboprop or turbojet, comprising: at least one device for centering and guiding rotation of a turbine engine shaft having an axis, the device comprising:a roller bearing axially mounted around the shaft and carried by a first annular support;a ball bearing axially mounted around the shaft and carried by a second annular support; andan oil film compression damper axially arranged around the roller bearing and including an oil-filled annular space defined by a rigid annular support surrounding a portion of the first annular support,the first annular support and second annular support being configured to be fastened with the annular support of the damper to a casing of the turbine engine, with each of the first annular support and second annular support including an elastically deformable annular portion,wherein the second annular support, the rigid annular support of the damper, and the roller bearing are stacked around one another transversely to said axis, so that the second annular support and the rigid annular support surround the roller bearing,wherein the bearing supports and the damper are fastened to an annular flange of said casing of the turbine engine, the flange being situated in a plane transverse to said axis, substantially containing the damper and the roller bearing, andwherein the flange of said casing is an interference fit on longitudinal reinforcing splines of the annular support of the damper. 19. A device for centering and guiding rotation of a turbine engine shaft having an axis, the device comprising: a roller bearing axially mounted around the shaft and carried by a first annular support;a ball bearing axially mounted around the shaft and carried by a second annular support; andan oil film compression damper axially arranged around the roller bearing and including an oil-filled annular space defined by a rigid annular support surrounding a portion of the first annular support,the first annular support and second annular support being configured to be fastened with the annular support of the damper to a casing of a turbine engine, with each of the first annular support and second annular support including an elastically deformable annular portion,wherein the first annular support is fixed through the elastically deformable annular portion to a fastener flange, andwherein the fastener flange, the roller bearing and the ball bearing are successively axially mounted around the shaft. 20. A turbine engine, or an airplane turboprop or turbojet according to claim 19, wherein the second annular support and the rigid annular support surround the roller bearing.