Rotary compression mechanism

A rotary compression mechanism comprising:

• a shaft attached to a casing;
• a drive cylinder rotatably supported on the shaft and having an inner surface of a cylindrical shape or an inner surface of a variant shape;
• a rotor provided inside the drive cylinder and having a second rotation center which is eccentric with respect to a first rotation center of the drive cylinder such that an outer periphery of the rotor is in contact with an inner periphery of the drive cylinder at a contact portion;
• a transfer mechanism connecting the drive cylinder and the rotor to have rotational motion at a constant speed;
• and
• a partition plate dividing a space defined between the inner periphery of the drive cylinder and the outer periphery of the rotor, wherein
• the partition plate has a structure by which one end of the partition plate is let in and out in a vicinity of the inner periphery of the drive cylinder or in a vicinity of the outer periphery of the rotor,
• the transfer mechanism includes a plurality of sets of
• a pin attached to the drive cylinder, and
• an inner peripheral groove provided to the rotor, and
• the pin slides on an inner periphery of the inner peripheral groove to transfer torque to the rotor by rotation of the drive cylinder, wherein
• the rotor is driven by through pin without being driven through the partition plate.