Disconnectable hydraulic steering assistor

In a disconnectable hydraulic steering assistor for a vehicle with a hydraulic pump, an electric motor therefor and a relay operatively connected together, the vehicle being driven by an electromotor, running on wheels and being actuated by means of a drive control means, the improvement comprising

• a time relay means, operatively connected to said hydraulic pump in turn via the first-mentioned relay and the electric motor,
• switch means disposed in the drive control means and when closed for turning on the electric motor of the hydraulic pump for the steering assistor via said time relay means and said first-mentioned relay,
• said time relay means for turning off the electric motor of the hydraulic pump for the steering assistor via the first-mentioned relay when said time relay means is activated after expiration of a time delay thereof,
• said electromotor has an operative armature shaft, said armature shaft being operatively connected to said electromotor so as to rotate when said vehicle is moving,
• pulse generator means operatively disposed in said electromotor for transmitting pulses to said time relay means when said armature shaft rotates,
• said time relay means for being unactivated when said pulses are received by said time relay means for preventing the expiration of the time delay and for keeping the electric motor of the hydraulic pump turned on via said first-mentioned relay,
• said pulse generator means for stopping said pulses when said armature shaft is stationary,
• said drive control means in a zero inoperative position thereof for opening said switch means,
• said time relay means, in said zero inoperative position with said switch open and when said pulses are stopped, for being activated, whereby the electric motor of the hydraulic pump for the steering assistor after the expiration of said delay time is turned off.