Hybrid ball bearing with oblique contact

F - Mech Eng,Light,Heat,Weapons – 16 – C

Patent

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Details

F16C 33/32 (2006.01) F16C 19/18 (2006.01) F16C 33/30 (2006.01) F16C 33/58 (2006.01) F16C 33/62 (2006.01)

Patent

CA 2384560

The invention concerns a ball bearing comprising two rows of ceramic balls (1) and with oblique contact between two substantially back-to-back inner ball bearing tracks, on an outer steel ring (2) and outer ball bearing tracks substantially facing each other, on inner half-rings (4 and 5) capable of being axially preloaded against each other, the tracks of the outer (2) and inner (3) rings being coated with an alloy coating based on dense chromium co-operating with the ceramic of the balls (1) to provide the ball bearing with excellent rigidity, protection against corrosion and tribological behaviour under load, and a reduced global volume, thereby considerably reducing degradation of the lubricating grease and maintenance costs. The invention is applicable to large diameter preloaded hybrid ball bearings, to absorb axial loads, and in particular for equipping swashplates of helicopters.

Le roulement comprend deux rangées de billes (1) en céramique et à contact oblique entre deux pistes de roulement intérieures, sensiblement dos-à-dos, sur une bague extérieure (2) en acier et des pistes de roulement extérieures, sensiblement face-à-face, sur des demi-bagues intérieures (4 et 5) aptes à être axialement préchargées l'une contre l'autre, les pistes des bagues extérieure (2) et intérieure (3) étant recouvertes d'un revêtement d'alliage à base de chrome dense coopérant avec la céramique des billes (1) pour donner au roulement une rigidité, une protection anti-corrosion et un comportement tribologique sous charge qui sont excellents, ainsi qu'une masse globale réduite, d'où une dégradation fortement réduite des graisses de lubrification et des coûts de mainteance réduits. Application aux roulements à billes hybrides à contacts obliques préchargés de grands diamètres, pour encaisser des efforts axiaux, et en particulier à l'équipement des plateaux cycliques d'hélicoptères.

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