PURPOSE: To allow the height of an air spring to be changed rapidly by connecting the air spring, formed by connecting the end parts of a cylindrical flexible film body airtightly to an upper and a lower fitting members, to an auxiliary tank, provided with a movable or flexible partition wall for changing the volume through a conduit.
CONSTITUTION: An air spring 1 is of a single bellows element type formed by connecting the upper and lower end parts of a cylindrical flexible film body 4 airtightly to an upper and a lower face plates 3a, 3b. An elastic laminated body 7 formed of plural elastic rings 5 and plural rigid rings 6 laminated alternately is airtightly fitted to the lower face plate 3b of the air spring 1, and the air spring 1 is connected to an auxiliary tank 2 through a conduit 8 connected to the elastic laminated body 7. The auxiliary tank 2 is formed into cylindrical shape, for instance, and its inside is partitioned by a piston 9 serving as a movable partition wall. With the advancing/receding action of the piston 9 in the auxiliary tank 2, the internal pressure of the auxiliary tank 2 and in its turn the internal pressure of the air spring 1 is made high/low, which results in directly increasing/decreasing the height of the air spring 1.
HIGASHIYA REI