PURPOSE: To supply and discharge air promptly by supplying air for respective tires when a suspension is extended, and discharging air when the suspension is contracted so as to aid the above mentioned actions by the change of tire inner pressure following the contraction of suspension.
CONSTITUTION: An air supply system 10 to right and left front tires and rear tires 1-4 is provided with an compressed air pump 11, a pressure accumulator 13 into which compressed air is introduced through a check valve 12, an air supply passage 14 which supply compressed air to respective tires 1-4, and three-way change-over valves 151-154 which are respectively formed on branch parts 141-144 to the respective tires 1-4 of the passage 14. Signals from suspension sensors 261-264 at least are inputted into a controller 20, which operates the above-mentioned three-way change-over valves 151-154 and controls air pressure in the respective tires 1-4 according to driving conditions. It is so carried out as to supply air to the tires when suspension extension is detected and discharge air from the tires when suspension contraction is detected.
MURAKAWA KATSUJI
KAMIMURA HIROKI
