Scroll type fluid machine

Abstract

To realize an increase in lifespan and a reduction in cost in an interlocking mechanism that causes a driving scroll and a driven scroll to rotate synchronously, a through hole is drilled into a peripheral edge portion of a driving scroll side end plate, and a pin member is fixed to the through hole. A base is provided on a driven scroll side spiral projection that faces the through hole. A columnar recessed portion is carved into an opposing surface of the base, and an aluminum rotary body is loosely fitted into the recessed portion. An eccentric hole is drilled into the rotary body, and the pin member is loosely fitted into the eccentric hole. The interlocking mechanism is disposed in an odd number at equal intervals on an outer edge portion of the scroll end plate such that loads exerted on the rotary body act in an identical plane.

1 . A double rotation type scroll fluid machine comprising:
 a driving scroll;   a driven scroll disposed in an offset position relative to an axial center of the driving scroll in order to compress or expand a fluid in conjunction with the driving scroll; and   an interlocking mechanism that causes the driven scroll to rotate synchronously in conjunction with rotation of the driving scroll while performing a revolving motion about the axial center of the driving scroll,   wherein the interlocking mechanism is formed of:   a columnar or conical rotary body that includes an eccentric hole formed in an axial direction and is loosely fitted into a columnar or conical recessed portion provided as a recess in one of respective end plates of the driving scroll and the driven scroll in a site where the respective endplates oppose each other;   a pin member that projects from the other one of the end plates and is inserted loosely into the eccentric hole; and   a rotary bearing interposed in respective sliding surfaces between the recessed portion and the rotary body and between the eccentric hole and the pin member, and   the interlocking mechanism is provided in a plurality of locations in a circumferential direction of the scroll.   
     
     
         2 . The double rotation type scroll fluid machine according to  claim 1 , further comprising a coupling body that is disposed in a position facing a back surface of one of the end plates of the driving scroll and the driven scroll and coupled to an outer peripheral site of the other end plate,
 wherein the interlocking mechanism is interposed between the other end plate and the coupling body.   
     
     
         3 . The double rotation type scroll fluid machine according to  claim 2 , wherein the coupling body is constituted by a ring-shaped disc having in a central portion thereof a through hole through which a shaft portion of the scroll is passed, and
 a coupling portion that is coupled to the outer peripheral site of the one end plate is formed on an outer peripheral end of the coupling body.   
     
     
         4 . The double rotation type scroll fluid machine according to  claim 1 , wherein the rotary bearing is a sliding bearing or a rolling bearing.