Patent ID: 8726825

Claim:
A servo-assisted steering device for a marine vehicle comprising: a manual control member connected to a shaft, the shaft driving a conversion unit when the control member is rotated, the conversion unit having a delivery and suction side connected to one of two chambers respectively of one or more steering actuators through hydraulic pipes to feed a pressurized fluid alternately either to one or the other of the two chambers of the one or more steering actuators depending on moving direction of the manual control member; an assist control system for the one or more steering actuators, the assist control system being also connected to the hydraulic pipes, the assist control system comprising a hydraulic fluid tank and an automatic pump which is driven by a driving motor, the assist control system providing the pressurized fluid to the hydraulic pipes when the steering wheel is operated, the automatic pump increasing an amount of pumped fluid, and one or more of a pressure exerted by the conversion unit or a flow rate of the pumped fluid, thereby reducing resistance when steering the manual control member; and a system setting/changing a number of revolutions per minute of the driving motor driving the automatic pump, the system setting/changing the number of revolutions per minute controlling or modifying the number of revolutions per minute of the driving motor based on changes in operating conditions of mechanical members of the marine vehicle, wherein the system setting/changing the number of revolutions per minute of the driving motor comprise an active or passive element generating a command setting/changing the number of revolutions per minute of the driving motor, the active or passive element being manually operated.