Turbomachine with a compact roller bearing
View Patent ↗A turbomachine roller bearing that supports a shaft constituted by a trunnion of a shaft line of a high-pressure spool of a turbomachine to rotate relative to a stationary support that is connected to a casing of the turbomachine, said bearing comprising rollers inserted between an outer ring disposed adjacent to the stationary support and an inner ring disposed adjacent to the high-pressure trunnion, the inner ring extending along the axis beyond a downstream end of the high-pressure trunnion to which it is secured by clamping means, and being provided with anti-rotation means for preventing said inner ring from rotating relative to the high-pressure trunnion.
1. A turbomachine comprising:
a high-pressure turbine including a high pressure turbine disk and rotor blades mounted on the high pressure turbine disk, said blades being subject to a flow of hot gas from a combustion chamber, said flow of hot gas defining upstream and downstream directions for said turbomachine;
a high-pressure trunnion having an upstream end connected to the high pressure turbine disk and a downstream end extending downstream of said high pressure turbine disk; and
a roller bearing that supports the high-pressure trunnion to rotate relative to a stationary support, said bearing comprising rollers, an inner ring and an outer ring, said rollers being inserted between said outer ring and said inner ring, said outer ring being disposed adjacent to the stationary support and said inner ring being disposed adjacent to the high-pressure trunnion, wherein the inner ring extends downstream beyond the downstream end of the high-pressure trunnion to which the inner ring is secured, said inner ring also being provided with an anti-rotation mechanism that prevents said inner ring from rotating relative to the high-pressure trunnion,
wherein the rollers are disposed at the end of the inner ring which extends downstream beyond the downstream end of the high-pressure trunnion.
2. A turbomachine according to claim 1 , wherein the inner ring is disposed inside the high-pressure trunnion.
3. A turbomachine according to claim 2 , wherein the inner ring includes at least one notch that is arranged to cooperate axially with at least one catch arranged in the downstream end of the high-pressure trunnion, so as to prevent said inner ring from rotating relative to the high-pressure trunnion.
4. A turbomachine according to claim 3 , including a nut for being clamped against an upstream end of the inner ring, in order to secure the inner ring to the high-pressure trunnion.
5. A turbomachine according to claim 2 , wherein the inner ring includes a plurality of splines arranged at an upstream end and arranged to cooperate radially with complementary splines of the high-pressure trunnion, so as to prevent said inner ring from rotating relative to the high-pressure trunnion.
6. A turbomachine according to claim 5 , including a nut for being clamped onto the inner ring, at the downstream end of the high-pressure trunnion, in order to secure the inner ring to the high-pressure trunnion.
7. A turbomachine according to claim 1 , in which at least a portion of the inner ring is disposed outside the high-pressure trunnion, said bearing including at least one peg for being inserted radially into holes respectively in the inner ring and in the high-pressure trunnion, in order to prevent the inner ring from rotating relative to the high-pressure trunnion.
8. A turbomachine according to claim 7 , including an additional ring disposed inside the high-pressure trunnion and having a downstream end that is provided with a radial shoulder for bearing axially against a downstream end of the inner ring, and also includes a nut for being clamped against an upstream end of the additional ring so as to secure the inner ring to the high-pressure trunnion.
9. A turbomachine according to claim 1 , wherein the inner ring is disposed in line with the high-pressure trunnion.
10. A turbomachine according to claim 9 , wherein the inner ring includes a plurality of teeth arranged at an upstream end and intended to cooperate axially with a plurality of complementary teeth arranged at the downstream end of the high-pressure trunnion, so as to prevent said inner ring from rotating relative to the high-pressure trunnion.
11. A turbomachine according to claim 10 , including a nut for being clamped against an upstream end of the inner ring in order to secure the inner ring to the high-pressure trunnion.
12. A turbomachine according to claim 10 , wherein the respective teeth of the inner ring and of the high-pressure trunnion are of trapezoidal shape.
13. A turbomachine according to claim 1 , wherein the inner ring of the roller bearing is not mounted directly on the high-pressure trunnion.