| 摘要 |
A fluid drive wherein the runner and impeller assemblies are disposed within a nominally closed tank which defines an oil sump. A fan-filter unit assembly is provided for drawing oil mist from the tank interior through the filter unit, whereby a partial vacuum is established within the tank interior which prevents the mist from leaking into the surrounding atmosphere through small joints in the housing and protruding shafts. The fan-filter unit comprises an oil coalescing device in an upstream portion of the fan-filter unit and a fine mesh filter for trapping fine oil mist droplets which pass through the coalescing device without undergoing coalescence. The coalescing device and fine mesh filter are interconnected by a conduit which has a drain line for draining the coalesced oil droplets into an oil sump.
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