Chain wheel arrangement

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.