Disconnectable coupling with lubrication control

1. A disconnectable coupling device rotatable about an axis, comprising:

a first shaft having an end and a hub formed on the end, the hub including a flange extending radially from the end and a round wall projecting axially from the flange and defining a hollow;

a second shaft aligned with the first shaft and opposed to the end of the first shaft, the second shaft having a drum overhanging the hub;

a multi-plate clutch held between the hub and the drum to disconnectably connect the hub with the drum;

a cup fixed with the hub so as to define a gutter around the first shaft;

a housing defining an opening so dimensioned as to leave a space around the first shaft to establish fluid communication from outside the housing through the space to the gutter in the housing; and

one or more perforations axially passing through the flange to establish fluid communication between the gutter and the hollow,

wherein the cup includes a radially outer wall and a bottom radially inwardly projecting from the outer wall and leaving an opening through which the first shaft passes so that the flange of the hub, the outer wall and the bottom in combination define the gutter,

wherein the perforations are disposed at least partly radially outwardly beyond a rim of the opening defined by the cup.

2. The device of claim 1 , further comprising:

one or more through-holes radially passing through the hub to establish fluid communication between the hollow and the multi-plate clutch.

3. The device of claim 1 , wherein the hub axially projects beyond the end of the first shaft toward the second shaft.

4. The device of claim 1 , wherein the cup fits on an outer periphery of the hub.

5. The device of claim 1 , further comprising:

a fluid passage passing through the housing and directed to the gutter.