Abstract: A scroll-type refrigerant fluid compressor includes a fixed scroll having a first circular end plate from which a first spiral wrap extends, and an orbiting scroll having a second circular end plate from which a second spiral wrap extends. The spiral wraps interfit each other at an angular and radial offset to form line contacts defining a pair of sealed-off fluid pockets. An anti-wear plate is disposed on one end surface of the second circular end plate of the orbiting scroll that engages with the second spiral element of the orbiting scroll. An annular boss is formed at a central portion of the other end surface of the second circular end plate of the orbiting scroll. An inner end of a drive shaft is operatively connected to the orbiting scroll through a bushing which is rotatably disposed within the boss. An axial hole is centrally formed through the second circular end plate of the orbiting scroll.

Abstract: A scroll type compressor with a variable displacement mechanism is disclosed and includes a housing having an inlet port and an outlet port. A fixed scroll is fixedly disposed within the housing and has a first circular end plate from which a first spiral element extends. An orbiting scroll includes a second spiral element interfitting with the spiral element. The first circular end plate partitions an inner chamber of the compressor housing into a front suction chamber linked to the inlet port, and a rear chamber. The rear chamber is further divided by a wall of said housing into a discharge chamber linked to the fluid outlet port and an intermediate pressure chamber. At least one pair of holes is formed through the circular end plate of the fixed scroll forming a fluid channel between fluid pockets formed between the spiral elements of the scrolls and the intermediate pressure chamber.