Body amplitude sensitive air spring

1. A body amplitude sensitive air spring, which is installed in a vehicle to absorb shock from exterior, the body amplitude sensitive air spring comprising:

a first body fixed to a vehicle body side of the vehicle;

a second body fixed to a wheel side of the vehicle;

an air sleeve installed between the first body and the second body to serve as a spring while varying an outer shape thereof according to a change of an internal pressure; and

a valve structure for dividing an inner space of the air spring to form a plurality of chambers, and operating by inertia caused by a behavior of vehicle to selectively connect or block the plurality of chambers,

wherein the inner space of the air spring comprises a fixing chamber having a fixed volume and a working chamber having a variable volume by deformation of the air sleeve,

wherein the valve structure comprises:

a fixing plate installed at an end of the first body and having a through-hole;

a valve body installed in the fixing plate; and

a pair of upper and lower elastic members installed between the fixing plate and the valve body, and

wherein the valve body extends to the inner space of the fixing chamber and the inner space of the working chamber.

2. The body amplitude sensitive air spring of claim 1 , wherein the valve structure is installed in the first body having a hollow inside and divides the inner space of the air spring.

3. The body amplitude sensitive air spring of claim 2 , wherein the plurality of chambers formed by the valve structure comprises:

the fixing chamber formed by the valve structure and the first body; and

the working chamber formed by the valve structure, the air sleeve, and the second body.

4. The body amplitude sensitive air spring of claim 1 , wherein the valve body comprises:

an upper mass and a lower mass for generating a movement due to inertia; and

a coupling shaft coupling the upper mass and the lower mass.