Patent ID: 9353624
Filing Date: 2016-05-31
CPC Classification: F01C,F04C,F16C

Claim Text:
1. A scroll compressor comprising a housing, a fixed scroll that is fixed to the housing, a movable scroll that forms a compression chamber between the movable scroll and the fixed scroll, a boss portion that is formed at the movable scroll, a drive shaft axially supported by the housing rotatably around a drive shaft axis, an eccentric shaft portion that is eccentric from the drive shaft axis and is rotatable integrally with the drive shaft, and a drive bush that is fitted onto the eccentric shaft portion and is fitted into the boss portion, and causes the movable scroll to orbit with respect to the fixed scroll, wherein a motor mechanism that drives the drive shaft is provided in the housing, the movable scroll has a movable base plate in which the boss portion is formed in a center, and a movable spiral wall that has a spiral shape and extends in a direction opposite to the boss portion from the movable base plate, a bearing is provided in at least one of a space between the drive bush and the boss portion, and a space between one end portion at the drive bush side in the drive shaft and the housing, the bearing has a cylindrical outer sliding member that is provided at a side of an outer bearing-receiving portion that serves as the boss portion or the housing, and a cylindrical inner sliding member that is provided at a side of an inner bearing-receiving portion that serves as the drive bush or the one end portion of the drive shaft, an outer boundary zone is defined by an inner circumferential surface of the outer bearing-receiving portion and an outer circumferential surface of the outer sliding member, a middle boundary zone is defined by an inner circumferential surface of the outer sliding member and an outer circumferential surface of the inner sliding member, an inner boundary zone is defined by an inner circumferential surface of the inner sliding member and an outer circumferential surface of the inner bearing-receiving portion, wherein at least two boundary zones of the outer boundary zone, middle boundary zone, and inner boundary zone, relative rotation is generated, and the outer sliding member and the inner sliding member have different lengths in an axial direction, and thereby form a step in at least one end in the axial direction, a main bearing that serves as the bearing is provided in the space between the boss portion which is the outer bearing-receiving portion and the drive bush which is the inner bearing-receiving portion, the drive bush has a chamfer in at least one of both ends in the axial direction, and movement restriction means that restricts the inner sliding member from moving to the chamfer is provided between the outer sliding member and the movable scroll, or between the outer sliding member and the drive bush.