| 1. A chain wheel arrangement for driving or reversing stations of underground scraper chain conveyors, comprising a unitary
chain wheel, a chain-wheel shaft comprising a splined portion between two offset-diameter shaft stub portions and to which
the chain wheel can be fastened in rotational engagement by axial sliding on to said splined portion, also comprising bearing
shells receiving bearings for the chain-wheel shaft, disposed on each side of the chain wheel and adapted to be fastened in
bearing-shell recesses, open at the edges, in the side cheeks of the driving or reversing station, the bearing shells being
formed with axial lubricating lines for lubricating the bearings, also comprising connecting lines that open into the lubricating
lines and are connected to lubricating nipples or lubricant supply bores in end flanks or side flanks of the bearings shells,
also comprising bearing support rings which abut the outer cage of the bearings, and securing means comprising spacer sleeves
for axially securing the chain wheel relative to the splined portion, in which the spacer sleeves are axially movable between
the bearings and the chain wheel, wherein a clamping cover is fastened to at least one shaft end and presses against a clamping
sleeve which clamps a spacer ring against the associated bearing and moves said associated bearing axially against said spacer
sleeve to move said spacer sleeve axially against said chain wheel.
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