Patent ID: 7793636

Claim:
A rotary apparatus comprising: two sleeves; first and second vanes, each vane coupled with a shaft by means of a coupling arrangement actuated by cams to a single sleeve; a liner, wherein each vane is placed inside the liner; and timing devices, wherein one of the first and second vanes rotate through a first predetermined variable angle independently, while the other vane is stationary, followed by the first and second vanes rotating through a second predetermined variable angle simultaneously in response to operation of the timing devices, wherein: the first vane is located at a first initial position and the second vane is located at a second initial position, the first vane rotating independently from the second vane through the first predetermined variable angle; the first and second vanes rotating simultaneously through the second predetermined variable angle until the second vane is located in the first initial position and the first vane is located in the second initial position; the second vane alternately rotating independently through the first predetermined variable angle; and wherein a defined angular position at which said one of the first and second vanes is held stationary, when the other vane is rotating through the initial predetermined variable angle, results in the apparatus functioning with a variable compression ratio.