| 摘要 |
The invention provides roller element bearings for roller conveyors. The bearings fit into the ends of hollow sleeve bodies to define the rollers of the conveyor. The bearings are designed to prevent the ingress of water through the bearings into the interior of the sleeve bodies, because collection of liquid in these bodies is unhygienic in food factory applications. The bearings are designed to act as water seals by the design of labyrinth seals between the inner and outer races of the bearings in that the labyrinth gaps are designed to allow outflow of liquid from the bearings, The clearances are not made so large as to allow excessive inflow of liquid into the bearing. The labyrinth seal therefore acts in two ways. It limits inflow of liquid into the bearing and also allows outflow of that liquid from the bearing to prevent accumulation of liquid in the bearing.
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