Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Scroll type fluid machinery
 A mechanism preventing rotation is mainly composed of plural swivel pins (31) projectingly provided on an end plate of a swiveling scroll (15), housing pins (32) which is the same number as the swivel pins (31) on a front end plate (11b) provided onto the end plate, and a pin engaging member (33) having plural holes (34) in which these pins (31) and (32) respectively. These holes (34) are formed sufficiently larger diameter than the swivel pin (31) and the housing pin (32). According to this mechanism preventing rotation, while the swiveling scroll (15) performs a revolution swivel movement, these pins (31) and (32) and the inner surface of the pin engaging member (33) controls radial maximum variation with sliding-contacting each other. Accordingly, fluid leak that occurs by an engaging position error of a stationary scroll and the swiveling scroll is effectively prevented and long service life and improvement of degree of freedom of designs are actualized. 
Mitsubishi Heavy Industries, Ltd.
F
F01C
inventional
Kou Makoto
Tanaka Takeuchi