Self-pressure regulator tire mechanism
An apparatus for regulating air pressure level in a tire is provided. The apparatus includes a housing attached to the tire; a piston located inside the housing, coupled to the housing via a spring; a one-way valve; and locking elements located at a specified location along the housing, wherein the piston is configured to move towards a first end of the housing responsive to an imbalance between centrifugal force applied to the piston due to angular speed of the tire and force applied to it by the spring, wherein the locking elements are configured to lock the piston at the specified location whenever the tire reaches a predefined angular speed, and release the piston once the angular speed of the tire crosses a predefined threshold, so that the piston moves towards a second end of the sleeve producing an air pulse, conveyed by the one-way valve into the tire.
1. An apparatus for regulating an air pressure level in a tire comprising:
a housing to be coupled to said tire;
an internal piston located within said housing, wherein the housing allows the internal piston to move substantially along a radius of said tire;
an internal spring located within said housing to apply a force to said internal piston;
a one-way valve; and
locking elements located at a specified location along said housing, and mechanically controlled by an external piston connected to an external spring which is concentric with respect to the internal spring,
wherein said internal piston is configured to move towards a first end of the housing responsive to an imbalance between centrifugal force applied to the internal piston due to angular speed of the tire and force applied thereto by the internal spring,
wherein the locking elements are configured to lock the internal piston at said specified location whenever said tire reaches a predefined angular speed,
wherein the locking elements are further configured to release the internal piston once the angular speed of the tire crosses a predefined threshold, so that said internal piston moves towards a second end of the housing and produces an air pulse, and
wherein the one way valve is configured to convey the air pulse into the tire as long as the air pressure level of the tire is below a predefined target air pressure level.
2. The apparatus according to claim 1 , wherein the air pulse is created when the angular speed is reduced below a predefined threshold.
3. The apparatus according to claim 1 , wherein the air pulse is created when the angular speed is increased above a predefined threshold.
4. The apparatus according to claim 1 , wherein the one-way valve is further configured to release the air pulse back to ambiance, whenever the air pressure level of the tire is equal to or above a predefined target air pressure level.
5. The apparatus according to claim 1 , further comprising a screw associated with the external spring and configured to determine a K constant of the external spring, and wherein setting the K constant affects the target air pressure level of the tire.
6. The apparatus according to claim 1 , wherein the housing is equal to or shorter than a radius of the tire.
7. The apparatus according to claim 1 , wherein a volume of the internal piston is at least 100 times smaller than the volume of the tire.
8. The apparatus according to claim 1 , further comprising a tube connecting the housing with a valve of said tire.