(57) The speed reducing gear (7-14) which connects kinematically the impeller (G) of the
turbine with the axis of the rotating brush (SR) is housed in a box (S) the walls
(19) of which are preferably obtained integral with the bottom of the body (1) of
the same hydrobrush, which is sufficiently closed by suitable means and which is provided
with suitable openings in order to ensure a good soundproofing of the operation of
said gear, in order to protect the same against the action of the dirty removed by
the rotary brush and to ensure, at the same time, a sufficient circulation of the
water in said box for the lubrication of said speed reducing gear. The housing box
(S) of the gear can be closed by the body closed in its upper portion of the impeller
(G), or by a suitable lid (21) snap assembled, for example, onto said side walls (19),
and provided with a hole (22) traversed with clearance by the hub of the impeller,
with the toothed wheel (14) of input of the motion. The box (S) is provided in height
with openings (20) placed, for example, in the corner zones of the side walls (19).
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