(57) A driving mechanism with energy storing feed system particularlyforthe loading-travelling
motions of portal cranes having a hydraulic motor (3) in driving connection with an
element (1) to be driven, a hydraulic supply unit (2) for operation of the hydraulic
motor, the hydraulic supply unit being arranged to drive the motor (3) in synchronous
operation with a hydraulic reversing unit (4) which is also in driving connection
with the element (1) to be driven, and an energy storing unit (5) provided with a
charger (6) in functional connection with the hydraulic reversing unit. The arrangement
ensures that the energy necessary forthe driving mechanism to drive the element with
direct energy input, also uses reserve power in the energy storing unit (5) derived
from braking energy, this being transmitted through the separate reversing unit (4)
when accelerating extra energy is required.
With use of the invention the amount of energy demand necessary for the operation
of cranes can be reduced by over 50 per cent. The generally known energy saving expectations
are met in an extremely high degree with the solution.
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