CO-ROTATING SCROLL COMPRESSOR

1 . A co-rotating scroll compressor comprising:

a driving side scroll member rotatably driven by a drive part, having a plurality of spiral driving side wall bodies installed with a predetermined angular interval around a center of a driving side end plate;

a driven side scroll member installed with a predetermined angular interval around a center of a driven side end plate, having a number of spiral driven side wall bodies corresponding to each of the driving side wall bodies, and forming a compression space by engaging each of the driven side wall bodies with the corresponding driving side wall bodies;

a synchronous driving mechanism transmitting driving force from the driving side scroll member to the driven side scroll member so that the driving side scroll member and the driven side scroll member synchronously revolve;

a first driving side bearing and a second driving side bearing rotatably supporting a shaft part of the driving side scroll member at one end side and the other end side in an axial direction; and

a first driven side bearing and a second driven side bearing rotatably supporting a shaft part of the driven side scroll member at one end side and the other end side in the axial direction, wherein

a preload is applied to the shaft part so that an axial clearance in a second driving side bearing direction is eliminated in the first driving side bearing, and a preload is applied to the shaft part so that an axial clearance in a first driving side bearing direction is eliminated in the second driving side bearing,

and/or

a preload is applied to the shaft part so that an axial clearance in a second driven side bearing direction is eliminated in the first driven side bearing, and a preload is applied to the shaft part so that an axial clearance in a first driven side bearing direction is eliminated in the second driven side bearing.

2 . The co-rotating scroll compressor according to claim 1 , comprising:

a driving side support member arranged via the driven side end plate, fixed to a distal end side in the axial direction of a driving side wall body and rotating together with the driving side scroll member; and

a driven side support member arranged via the driving side end plate, fixed to the distal end side in the axial direction of a driven side wall body and rotating together with the driven side scroll member, wherein

the first driving side bearing supports the shaft part of the driving side scroll member,

the second driving side bearing supports a shaft part of the driving side support member,

the first driven side bearing supports a shaft part of the driven side support member, and

the second driven side bearing supports the shaft part of the driven side scroll member.

3 . The co-rotating scroll compressor according to claim 2 , wherein

the distal end side of the driving side wall body and the driving side support member are fixed to allow displacement in the axial direction, and each of the shaft parts is supported by the first driving side bearing and the second driving side bearing, to allow an increase in a distance between the shaft part supported by the first driving side bearing and the shaft part supported by the second driving side bearing,

and/or

the distal end side of the driven side wall body and the driven side support member are fixed to allow the displacement in the axial direction, and each of the shaft parts is supported by the first driven side bearing and the second driven side bearing, to allow an increase in a distance between the shaft part supported by the first driven side bearing and the shaft part supported by the second driven side bearing.

4 . The co-rotating scroll compressor according to claim 1 , comprising:

the driving side scroll member including a first driving side scroll part having a first driving side end plate and a first driving side wall body, driven by the drive part, a second driving side scroll part having a second driving side end plate and a second driving side wall body, and a fixed portion of wall fixing the distal ends of the first driving side wall body and the second driving side wall body in a state in which the distal ends of the first driving side wall body and the second driving side wall body face each other in the axial direction,

the driven side scroll member including a first driven side wall body provided on one side face of the driven side end plate, engaged with the first driving side wall body, and a second driven side wall body provided on the other side face of the driven side end plate, engaged with the second driving side wall body,

a first support member arranged via the first driving side end plate, fixed to a distal end side in the axial direction of the first driven side wall body and rotating together with the first driven side wall body, and

a second support member arranged via the second driving side end plate, fixed to the distal end side in the axial direction of the second driven side wall body and rotating together with the second driven side wall body, wherein

the first driving side bearing supports a shaft part of the first driving side scroll part,

the second driving side bearing supports a shaft part of the second driving side scroll part,

the first driven side bearing supports a shaft part of the first support member, and

the second driven side bearing supports a shaft part of the second support member.

5 . The co-rotating scroll compressor according to claim 4 , wherein

the fixed portion of wall is fixed to allow the displacement in the axial direction, and each of the shaft parts is supported by the first driving side bearing and the second driving side bearing, to allow the increase in the distance between the shaft part supported by the first driving side bearing and the shaft part supported by the second driving side bearing,

and/or

the distal end of each of the driven side wall bodies and each of the support members is fixed to allow the displacement in the axial direction, and each of the shaft parts is supported by the first driven side bearing and the second driven side bearing, to allow the increase in the distance between the shaft part supported by the first driven side bearing and the shaft part supported by the second driven side bearing.

6 . The co-rotating scroll compressor according to claim 1 , comprising:

a first housing having a bearing fixing part to which the first driving side bearing and the first driven side bearing are fixed; and

a second housing contacted against and fixed to the first housing in the axial direction, and having the bearing fixing part to which the second driving side bearing and the second driven side bearing are fixed, wherein

a preload is applied to both the driving side bearings and/or both the driven side bearings, by contacting the first housing and the second housing each other in the axial direction to be fixed.

7 . The co-rotating scroll compressor according to claim 1 , wherein the first driving side bearing is provided on a shaft part on an opposite side sandwiching the drive part as seen from the driving side end plate of the driving side scroll member.