Rotary device

An apparatus comprising:

• a rotor which, in use, is configured to rotate about a rotation axis, the rotor comprising:
• a body having defined therein a plurality of arcuate voids each presenting away from the rotation axis;
• and
• a plurality of vanes, each vane of the plurality of vanes corresponding to a void of the plurality of voids, and each vane of the plurality of vanes adapted to:
• be pivotally mounted to the body for movement between a retracted position and an extended position;
• move within the void between the retracted and extended positions;
• and
• terminate in a tip;
• wherein each vane of the plurality of vanes comprises a roller bearing, the roller bearing of each vane of the plurality of vanes defining the corresponding tip;
• a stator:
• defining the rotation axis;
• and having an annular surface which, in use, is swept by the tips of the vanes during rotation of the body, the annular surface being positioned such that, in each rotation, each vane makes a cycle between the extended position and the retracted position thereof;
• a sealing arrangement defining a pair of ports and adapted, in combination with the rotor and the stator, to define, in use, chambers that increase in volume when in communication with one port of the pair of ports and that decrease in volume when in communication with an other port of the pair of ports, the sealing arrangement further defining a pair of tracks, the pair of tracks spaced apart from one another in a direction of the rotation axis, a follower of each vane of the plurality of vanes positioned in each track of the pair of tracks, the follower being a roller mounted for rotation relative to the corresponding vane of the plurality of vanes about an axis parallel to the rotation axis, wherein the axis of the follower is coincident with an axis of the roller bearing that defines the tip.