Rolling bearing in aircraft
View Patent ↗A single-row or multi-row rolling bearing comprising thin-walled bearing races which are made of a martensitic, through hardened steel and have the following characteristics: a surface hardness of ≧613 HV (56 HRC) in the area of the bearing face; a core hardness of ≧285 HV (28 HRC); a difference of ≧150 HV (9 HRc) between the surface hardness and the core hardness. The core hardness is reached at a depth ranging between 8 percent of the diameter of the rolling elements and 90 percent of the wall thickness on the bottom of the track. There is a ratio of ≧20 between the diameter of a pitch circle T k and the diameter of a rolling element D W .
1. A single-row or multi-row rolling bearing having thin-walled races, wherein an inner and outer races each having a respective running surface for rolling bodies between the races, the races having a core region outward of the running surfaces, the races are comprised of a martensitic, through hardened steel and also having the following features:
a surface hardness of ≧613 HV (56 HRC) in the regions of the running surfaces of the race,
a core hardness of ≧285 HV (28 HRC) of the race,
a difference (Δ) between the surface hardness and the core hardness of ≧150 HV (9 HRC),
the core hardness being reached at a depth into each race of between 8% of a diameter of rolling bodies between the races and 90% of a wall thickness in a race base beneath the running surface, and
a ratio of a pitch circle diameter T k of the bearing to the rolling body diameter Dw of 3 20.
2. The rolling bearing as claimed in claim 1 , wherein the hardness at a depth of 4% of the rolling body diameter Dw is at most 70 HV (4 HRC) lower than at the surface.
3. The rolling bearing as claimed in claim 1 , wherein the races are of a corrosion-resistant steel.
4. The rolling bearing as claimed in claim 1 , further comprising at least one of securing flanges and reinforcing elements at the races.
5. The rolling bearing as claimed in claim 1 , further comprising rolling bodies between the races and rolling on the running surfaces, the rolling bodies are of through hardened, martensitic rolling bearing steel, or of surface-hardened steel, or of corrosion-resistant steel or of ceramic.
6. The rolling bearing as claimed in claim 5 , further comprising rolling bodies between the races and rolling on the running surfaces, and the rolling bodies are balls.
7. The rolling bearing as claimed in claim 5 , further comprising rolling bodies between the races and rolling on the running surfaces, and the rolling bodies are rollers.
8. The rolling bearing as claimed in claim 1 , further comprising rolling bodies between the races and rolling on the running surfaces.