Scroll-type compressor having bolted housings

A scroll-type compressor comprising:

• a center housing having a front end, a rear end, a stationary scroll integrally formed with the center housing, the stationary scroll including a base plate portion arranged at the rear end of the center housing and having an outlet hole, and a stationary scroll portion arranged on the base plate portion and a peripheral wall which surrounds the stationary scroll and forms an outer surface of the center housing;
• a one piece front housing attached to the center housing at the front end thereof and having an outer surface;
• a rear housing attached to the center housing at the rear end thereof for forming an outlet chamber therein and having an outer surface wherein, the center housing, front housing and rear housing form an outer shell of the compressor;
• a drive shaft rotatably supported by the front housing and having a first axis;
• a movable scroll including a base plate portion and a movable scroll portion on the base plate portion for engagement with the stationary scroll portion to form a compression chamber between the stationary and movable scrolls, the movable scroll being connected to the drive shaft and having a second axis parallel to the first axis so that the movable scroll can revolve around the first axis and having means to prevent rotation about the second axis, the compression chamber communicating with the outlet chamber via the outlet hole;
• the rear housing having a first set of bolt holes at the outer surface thereof for receiving a first set of through bolts;
• and
• the front housing having a first set of threaded holes for receiving the first set of through bolts which are inserted in the first set of bolt holes from the rear side whereby the center housing is fastened between the front and rear housings by the fastening force of the through bolts.