An air compressor mountable within an annular tire cavity (5) of a pneumatic tire (1) is disclosed. The air compressor (10, 111, 211, 311, 411) comprises an air inlet (112) for receiving air to be pumped into the tire cavity (5), an air compression chamber...

A compressor mountable in an annular tire cavity (12) is disclosed. The compressor (14, 114, 214) comprises an air inlet (28), an air outlet (30), a body (40) in which are formed a blind hole (46) having a sidewall, a compression chamber (42) in fluid comm...

An air compressor mountable to a sidewall (3) of an annular tire cavity (5) is disclosed. The compressor (10, 100) comprises an air inlet (11) for receiving air to be pumped into the tire cavity (5); an air outlet (13) for releasing air into the tire cavit...

A pneumatic tire (1) is disclosed having a sidewall (3) and an annular tire cavity (5). The tire (1) comprisesa hydraulic actuator or engine (10) connected to the sidewall (3) of the tire (1) inside the annular tire cavity (5), the hydraulic actuator or en...

A tire system and a method of maintaining air in a pneumatic tire is disclosed. The system comprises a tire having a tire carcass comprising a tire cavity defined by a tire inner liner, and first and second sidewalls extending respectively from first and s...