Scroll-type fluid machine

Abstract

Provided is a scroll-type fluid machine which can reduce deformation of a rotary scroll caused when fixing a bearing into a boss part. A scroll compressor, in which a sealed chamber confining a fluid is formed by a fixed scroll and the rotary scroll meshed together, each of the scrolls having a spiral wall erected on one side face of an end plate, includes: a metallic boss part ( 15 C) protruding from the other side face of the end plate of the rotary scroll; a metallic rotary bearing ( 12 ) inserted into the boss part ( 15 C); a crankshaft rotating around an axis and including a bush part inserted in the rotary bearing ( 12 ) and rotatably supported by the rotary bearing ( 12 ); and an insert member ( 31 ) disposed between the boss part ( 15 C) and the rotary bearing ( 12 ) and having a thermal expansion coefficient greater than those of the boss part ( 15 C) and the rotary bearing ( 12 ).

1 . A scroll-type fluid machine, in which a sealed chamber confining a fluid is formed by a fixed scroll and a rotary scroll meshed together, each of the scrolls having a spiral wall erected on one side face of an end plate, the scroll-type fluid machine comprising:
 a metallic boss part protruding from the other side face of the end plate of the rotary scroll;   a metallic bearing inserted into the boss part;   a crankshaft rotating around an axis and including a bush part inserted in the bearing and rotatably supported by the bearing; and   an insert member disposed between the boss part and the bearing and having a thermal expansion coefficient greater than those of the boss part and the bearing.   
     
     
         2 . The scroll-type fluid machine according to  claim 1 , wherein
 the insert member has a ring shape and is disposed along an inner face of the boss part.