Synchronizing and unloading system for scroll fluid device

A scroll fluid device comprising, in combination:

• at least one pair of meshed axially extending involute spiral wraps having involute centers and defining at least one chamber between them that moves radially between an inlet zone and an outlet zone when one wrap is orbited by translation along a curvilinear path about an orbit center relative to the other wrap;
• wrap support means secured to and supporting each wrap;
• means for mounting said wrap support means for enabling relative orbital motion of the wraps relative to each other about an orbit radius;
• synchronizer means arranged to prevent relative rotation of one wrap relative to the other notwithstanding the orbital motion of one wrap relative to the other, said synchronizer being arranged to permit motion of one wrap relative to the other in a direction extending generally along a line connecting the involute centers of the wraps;
• said wrap support means arranged so that one wrap support means is movable relative to the other wrap support means in a direction generally along a line connecting the involute centers of the wraps, said one wrap support means being located normally such that the distance between involute centers corresponds with a selected orbit radius of the scroll fluid device;
• said synchronizer means comprising axially extending teeth integral with and projecting from one wrap support means and axially extending grooves provided in the other wrap support means, said teeth and grooves being interdigited;
• said teeth comprising radially and circumferentially extending elements having flat circumferentially spaced teeth side wall surfaces, said grooves defined by generally radially extending flat groove side wall surfaces;
• each of said teeth side wall surfaces being separated by a tooth width and each of said groove side wall surfaces being separated by a groove width, and wherein said groove width corresponds to the maximum orbital excursion of the teeth side wall surfaces, said teeth and groove side wall surfaces cooperating to prevent relative rotation between the scroll support means while accommodating their relative orbital motion.