Abstract: A performance of a compressor is enhanced and durability of scroll bodies is enhanced by optimizing relief to machining tolerance at a central end part of spiral members for forming the scroll bodies.

Abstract: In a scroll type compressor, the center and outer periphery portions of the spiral elements are provided with relief for preventing the mutual contact of the spiral elements. Both of the spiral elements come to contact with each other at the intermediate portion thereof. The relief at the center portion is formed within the range defined by the winding angle Y=32(X−1) where X is the winding turn of each of the spiral elements. The range of the intermediate portion is 380°. This construction serves to prevent the excessive pressure increase of the operation chamber at the center portion so that the brake down of the spiral elements may be prevented without lowering the efficiency of the compressor.

Abstract: A scroll type compressor having a front housing, a rear housing, an intermediate outer shell portion arranged between the front and rear housing to form an integral stationary scroll element having a stationary end plate and a stationary spiral member, a movable scroll element having a movable end plate and a movable spiral element and being engaged with the stationary scroll element to define a plurality of compression chambers shifting and reducing in volume to compress refrigerant gas, containing therein an oil component, in response to an orbiting motion of the movable scroll element, a suction port formed in the intermediate outer shell portion to directly introduce the refrigerant gas into the compression chambers, and a discharge chamber in which the refrigerant gas after compression is discharged from the compression chambers.

Abstract: A scroll type compressor using a crank mechanism having enough freedom so that an amount of eccentricity of the movable scroll member becomes variable. An elastic body is inserted between the facing surfaces striking each other in the inside of the crank mechanism so as to prevent generation of a noise due to the collision of the parts when starting up or shutting down the compressor.

Abstract: An eccentric shaft 5 is radially slidably inserted in a bore 6a of a bushing 6, which is inserted in an opening 8c-1 of a boss portion 8c of a movable scroll member 8 by way of a radial needle bearing 7. An axial space 24 is confined between a rear end of a bushing 6 and a bottom surface of the opening 8c-1. The space 24 is in communication with the radial bearing 7 via an annular gap 26 between faced surfaces of bushing 6 and the opening 8c-1. A radial space 23 is confined between the inner surface of the bore 6a and the eccentric shaft 5, so that a limited radial movement of the eccentric shaft 5 with respect to the bushing 6 is allowed. A washer 21 for obtaining a fixed axial location of the bushing 6 on the eccentric shaft 5 is formed with recess 21b (first passageway 25) for communicating the radial space 23 with the axial space 24. The bushing 6 is further formed with a radial hole 27 (second passageway) for communicating the radial space 23 with a crank chamber R.

Abstract: A large diameter portion of a rotating shaft is supported by an opening in a front housing via a radial bearing. An outer race of the bearing is in contact with an inner, rear surface of the housing as a shoulder portion of the opening. The inner surface is forwardly recessed, so that a small chamber is formed between the housing and the bearing unit. The housing has a stopper projection at a rear end of an opening to which a shaft seal unit is inserted. The projection is axially projected to a faced front surface of the large diameter portion of the shaft, while a seal chamber is formed between the shaft seal unit and the large diameter portion. The seal chamber is in communication with the small chamber. A plurality of circumferentially spaced grooves for holding lubricant are formed at the recessed surface for forming the small chamber.

Abstract: A scroll compressor having a driving shaft 6, on which a bushing 10 and a balancing weight 9 are supported. The drive shaft 6 includes, at its end, a drive projection 6a, which is engaged with a driven groove 10a formed in the bushing 10. A spring 20 is arranged between the drive projection 6a and the bushing 10 for urging the latter radially inwardly to reduce the radius of the orbital movement of the bushing 10. A centrifugal force generated in the bushing when the drive shaft 6 is rotated causes the bushing 10 to be moved radially outwardly to increasing the radius of the orbital movement of the bushing 10.

Abstract: When a rotary shaft of a scroll type compressor rotates and a movable scroll of the compressor makes an orbital movement around the axis of a rotary shaft by way of an eccentric shaft, refrigerant gas is supplied to compression chambers between a fixed scroll and the movable scroll. A first bearing rotatably supports the rotary shaft. A second bearing is provided between the movable scroll and the eccentric shaft to permit relative movement therebetween. A balance weight attached to the movable scroll dynamically balances the movable scroll during its rotation. A crank chamber accommodates the balance weight. A suction port is so provided in the housing as to communicate with the crank chamber, and permits the refrigerant gas to be supplied into the housing. A passage is formed in the balance weight, the eccentric shaft and the rotary shaft to supply the refrigerant gas into a first gap between the first bearing and the rotary shaft and a second gap between the second bearing and the movable scroll.