ROTARY UNION FOR AUTOMATICALLY CONTROLLING AIR PRESSURE OF TIRE

摘要

A rotary union is provided to control the pneumatic pressure of tire inside automatically. A rotary union(100) comprises a stator(110) in which the air infusion hole(111) is formed through the circumferential surface, a rotor(120) in which the air channel(121) is formed penetrating in inside in order to supply to the air flowed in into the air infusion hole to the inside tire of wheel, a first mechanical seal(130) partitioning off the flow channel space(115) connecting the air infusion hole and air channel, a first O-ring(150) which seals interval if it makes with the first mechanical seal and stator, a second mechanical seal(140) which it seals while contacting with each first mechanical seal, a second O-ring(160) sealing the outer circumference interval of rotor and the second mechanical seal, a pressurization mean(170) which pressurizes the second mechanical seal towards the first mechanical seal so that the first and the second mechanical seal interval be sealed.