Abstract: In order to ensure shrink-fitted components, such as a casing, to have a desirable force for holding a stator while maintaining a desirable durability, an electric compressor in which the stator is fixed to the casing by shrink fitting is configured as follows. Three protrusions 41f are provided protruding radially inside from the peripheral wall of a first casing 41 so as to be spaced apart from each other in the circumferential direction, and each protrusion 41f is provided with a groove 41f2 which extends in the axial direction in a circumferentially central portion of the protrusion 41f. Protruding end surfaces 41f1 of the protrusions 41f are fixed to the outer periphery of the stator 3 by shrink fitting at contact interfaces therebetween.

Abstract: Disclosed is a scroll fluid machine wherein a scroll unit achieves higher performance while maintaining reliability. The disclosed scroll fluid machine is provided with: a first actuation chamber (100) and second actuation chamber (102) partitioned by the central end (98) of a wrap (48, 64) of a fixed scroll (44, 60) and the central end (96) of a wrap (46, 62) of a movable scroll (42, 58); and a connection path (106, 119, 112). When at least part of a connection hole (52, 72) gets blocked by the central end of the wrap of the movable scroll as the movable scroll moves in a circle, the connection path connects the first and second actuation chambers with the connection hole. When the central ends of the wraps of the fixed and movable scrolls abut against each other, the connection path cuts off the connection between the first and second actuation chambers and the connection hole.

Abstract: [Object of the Invention] An object of the present invention is to provide a power transmission device, wherein the vibration in the direction along the longitudinal axis of the rotating shaft 102 of the driven side piece of equipment transmitted from the external power source to the driving side rotating member 3 is not easily transmitted to the driven side rotating member 4. [Disclosure of the Invention] A power transmission device 1 comprises a driving side rotating member 3 driven by an external power source, a driven side rotating member 4 fixed to a rotating shaft 102 of a driven side piece of equipment 100, and a resiliently deformed plate spring 51 fixed to the driving side rotating member 3 at one end and detachably clamped by the driven side rotating member 4 and a clamping member 53 fixed to the driven side rotating member 4 at the other end. The plate spring is made of damping alloy.