Rotation device and rotor compressor and fluid motor having the same

A rotation device, comprising:

• a cylinder block;
• a front end cover and a rear end cover which are tightly connected to a front end and a rear end of the cylinder block, respectively, and which define a cylindrical inner chamber together with the cylinder block;
• a main shaft which is rotatably supported by the cylinder block and/or the front and rear end covers, is partly located in the cylindrical inner chamber, and has a central axis coinciding with a central axis of the cylindrical inner chamber;
• an eccentric rotor assembly which is fitted over a portion of the main shaft located in the cylindrical inner chamber, and comprises:
• an eccentric shaft which is fitted over the portion of the main shaft located in the cylindrical inner chamber and has a central axis parallel to the central axis of the main shaft and offset from the central axis of the main shaft by a preset distance;
• a rolling piston wheel which is fitted over the eccentric shaft and has a central axis coinciding with the central axis of the eccentric shaft;
• and
• at least one rolling bearing which is symmetrically fitted over the eccentric shaft, and has an inner ring fixed to the eccentric shaft and an outer ring fixed to the rolling piston wheel to isolate rotation of the eccentric shaft from rotation of the rolling piston wheel, wherein the rolling piston wheel is pressed against an inner cylindrical surface of the cylindrical inner chamber by a preloading elastic force between the at least one rolling bearing and the rolling piston wheel, such that a sealed chamber extending in an axial direction is formed between the inner cylindrical surface of the cylindrical inner chamber and an outer cylindrical surface of the rolling piston wheel;
• and
• a partition mechanism partitioning the sealed chamber into a first chamber and a second chamber, the first chamber and the second chamber being independent of each other and being in communication with a first set of through hole and a second set of through hole disposed in the cylinder block, respectively;
• a first insertion groove distributed symmetrically with respect to a radial center line of grooves for rolling elements of the rolling bearing, formed on an inner cylindrical surface of the rolling piston wheel;
• and
• an elastic preloading element inserted in the first insertion groove and having a height in a state of receiving no force greater than a depth of the first insertion groove and generating the preloading elastic force;
• wherein the elastic preloading element comprises an annular, metal, spring plate sleeve, the spring plate sleeve including:
• an annular first perimeter edge;
• an annular second perimeter edge spaced apart from the first perimeter edge;
• a plurality of spaced apart elongated first slots, each first slot extending through the first perimeter edge and terminating at a first terminal location located toward the second perimeter edge;
• a plurality of spaced apart elongated second slots, each second slot extending through the second perimeter edge and terminating at a second terminal location located toward the first perimeter edge, each first slot being located between a separate pair of adjacent second slots,
• wherein the spring plate sleeve has a first width that extends between one of the first slots and an adjacently disposed one of the second slots and has a second width that extends between one of the first terminal locations and the second perimeter edge, the first width and the second width being substantially equal.