(57) A variable-displacement hydraulic motor with radial cylinders supplied by a rotary
fluid distributor (4) and acting on an eccentric ring (6) axially secured to a crankshaft
(7) but capable of moving radially with respect thereto, being provided with a device
for operating and controlling the variation of eccentricity of eccentric ring (6)
with respect to crankshaft (7), which comprises at least one pair of actuating pistons
(8, 9) located in counterposition to and independent of one another, arranged in a
radial sense between shaft (7) and ring (6), each of which is made mechanically integral
with such eccentric ring (6) via appropriate means of connection (8a, 9a), and at
least one pair of cross-connected valves (10) to block the flow of the fluid operating
such actuating pistons (8, 9).
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