| 摘要 |
Compound ball bearing including a shaft (1) journalled for rotation relative to a sleeve (2) with first and second outer raceways (5a, 5b) formed in an inner surface thereof by means of first and second rows (6a, 6b) of ceramic balls. The first row (6a) of balls runs round a first inner raceway (3a) formed in an inner ring (4) which is connected to the shaft (1) under an axial pre-load and the second set (6b) run round a second inner raceway (3b) formed around the shaft (1). A squeeze ring (8) axially positioned between the rows (6a, 6b) of balls, is press fitted to a thin walled portion (7) of the sleeve (2) to deform it inwardly at ambient temperature. The co-efficient of thermal expansion of the sleeve (2) is a least similar to that of the squeeze ring (8) so that reduction of the inward deformation resulting from an increase in bearing temperature counteracts increased bearing play which would develop without the squeeze ring (8). <IMAGE> |
