Scroll type compressor

Abstract

A scroll type compressor includes a housing, a rotary shaft rotatably supported in the housing and having an eccentric pin projecting from an end of the rotary shaft, a fixed scroll member and a movable scroll member facing the fixed scroll and forming a pair of compression chambers therewith. The scroll type compressor further includes a balancer-integrated bush having an eccentric hole to receive the eccentric pin and disposed between the eccentric pin and the movable scroll. The balancer-integrated bush is configured to receive rotational force from the rotary shaft to cause the movable scroll member to make an orbital movement. An elastic member provided between the rotary shaft and the balancer-integrated bush in an elastically deformed state to always apply a preload to the movable scroll member via the balancer-integrated bush in a direction that increases an orbital radius of the movable scroll member.

What is claimed is: 
     
         1 . A scroll type compressor comprising:
 a housing;   a rotary shaft rotatably supported in the housing;   an eccentric pin projecting axially from an end surface of the rotary shaft;   a fixed scroll member fixed to the housing;   a movable scroll member facing the fixed scroll and forming a compression chamber therewith;   a balancer-integrated bush having an eccentric hole to receive the eccentric pin and disposed between the eccentric pin and the movable scroll, the balancer-integrated bush being configured to receive rotational force from the rotary shaft to cause the movable scroll member to make an orbital movement; and   an elastic member provided between the rotary shaft and the balancer-integrated bush in an elastically deformed state to always apply a preload to the movable scroll member via the balancer-integrated bush in a direction that increases an orbital radius of the movable scroll member.   
     
     
         2 . The scroll type compressor according to  claim 1 , wherein the balancer-integrated bush has a first surface facing the end surface of the rotary shaft, wherein the end surface is provided with a first shaft recess and the first surface is provided with a first bush recess, wherein the first shaft recess and the first bush recess cooperate to receive the elastic member. 
     
     
         3 . The scroll type compressor according to  claim 1 , wherein the balancer-integrated bush has a second surface facing an outer peripheral surface of the rotary shaft, wherein the outer peripheral surface is provided with a second shaft recess and/or the second surface is provided with a second bush recess, wherein at least one of the second shaft recess and the second bush recess receives the elastic member.