Rotary compressor and air conditioner having the same

Abstract

A rotary compressor is provided, including: a rotation shaft; a driving motor which is coupled to a first side of the rotation shaft to supply a rotation force; a rotation cam which is eccentrically provided to a second side of the rotation shaft and supports a rolling piston rotating inside a cylinder which is provided under the driving motor; an upper radial bearing and a lower radial bearing which are provided to an upper part and a lower part of the rolling piston and support the rotation shaft in a radial direction; and an axial supporting part which comprises a first supporting member which is provided between the driving motor and the upper radial bearing, and a second supporting member which is provided between the rotation cam and the lower radial bearing.

1 . A rotary compressor, comprising:
 a rotation shaft;   a driving motor which is coupled to a first side of the rotation shaft to supply a rotation force to the rotation shaft;   a cylinder under the driving motor and having a rolling piston rotating therein;   a rotation cam which is eccentrically provided to a second side of the rotation shaft and supports the rolling piston;   an upper radial bearing and a lower radial bearing which are provided to an upper part and a lower part of the rolling piston respectively and support the rotation shaft in a radial direction thereof; and   an axial supporting part which comprises a first supporting member which is provided between the driving motor and the upper radial bearing, and a second supporting member which is provided between the rotation cam and the lower radial bearing.   
   
   
       2 . The rotary compressor according to  claim 1 , wherein the axial supporting part supports an axial load of the rotation shaft when the rotation shaft rotates, and the upper radial bearing is distanced from the rotation cam when the axial supporting part is coupled to the rotation shaft. 
   
   
       3 . The rotary compressor according to  claim 2 , wherein the upper radial bearing comprises a first lower surface,
 the rotation cam comprises an upper cam surface, and   the first lower surface of the upper radial bearing is distanced from the upper cam surface.   
   
   
       4 . The rotary compressor according to  claim 1 , wherein the upper radial bearing comprises a first lower surface,
 the rotation cam comprises an upper cam surface, and   the first lower surface of the upper radial bearing is distanced from the upper cam surface.   
   
   
       5 . The rotary compressor according to  claim 4 , wherein the upper radial bearing further comprises a first upper surface,
 the driving motor comprises a lower motor surface, and   the first supporting member is coupled between the first upper surface of the upper radial bearing and the lower motor surface.   
   
   
       6 . The rotary compressor according to  claim 3 , wherein the upper radial bearing further comprises a first upper surface,
 the driving motor comprises a lower motor surface, and   the first supporting member is coupled between the first upper surface of the upper radial bearing and the lower motor surface.   
   
   
       7 . The rotary compressor according to  claim 6 , wherein the lower radial bearing further comprises a second upper surface,
 the rotation cam further comprises a lower cam surface, and   the second supporting member is coupled between the second upper surface of the lower radial bearing and the lower cam surface of the rotation cam.   
   
   
       8 . The rotary compressor according to  claim 5 , wherein the lower radial bearing further comprises a second upper surface,
 the rotation cam further comprises a lower cam surface, and   the second supporting member is coupled between the second upper surface of the lower radial bearing and the lower cam surface of the rotation cam.   
   
   
       9 . The rotary compressor according to  claim 2 , wherein the first supporting member and the second supporting member respectively comprise a thrust ball bearing, and a pair of thrust rings which are rotatably contacted to the thrust ball bearing to opposite sides of the thrust ball bearing. 
   
   
       10 . The rotary compressor according to  claim 1 , wherein the first supporting member and the second supporting member respectively comprise a thrust ball bearing, and a pair of thrust rings which are rotatably contacted to the thrust ball bearing to opposite sides of the thrust ball bearing. 
   
   
       11 . A rotary compressor, comprising:
 a rotation shaft;   a driving motor which is coupled to a first side of the rotation shaft to supply a rotation force;   a cylinder under the driving motor having a first rolling piston and a second rolling piston rotating therein;   a first rotation cam and a second rotation cam which are eccentrically provided to a second side of the rotation shaft and support the first rolling piston and the second rolling piston;   an upper radial bearing and a lower radial bearing which are provided to an upper part of the first rolling piston and a lower part of the second rolling piston respectively and support the rotation shaft in a radial direction thereof; and   an axial supporting part which comprises a first supporting member which is provided between the driving motor and the upper radial bearing, and a second supporting member which is provided between the second rotation cam and the lower radial bearing.   
   
   
       12 . The rotary compressor according to  claim 11 , wherein the axial supporting part supports an axial load of the rotation shaft when the rotation shaft rotates, and the upper radial bearing is distanced from the first rotation cam when the axial supporting part is coupled to the rotation shaft. 
   
   
       13 . The rotary compressor according to  claim 12 , further comprising a middle plate which is interposed between the first rotation cam and the second rotation cam,
 wherein at least one of the first rotation cam and the second rotation cam are distanced from the middle plate.   
   
   
       14 . The rotary compressor according to  claim 11 , further comprising a middle plate which is interposed between the first rotation cam and the second rotation cam,
 wherein at least one of the first rotation cam and the second rotation cam are distanced from the middle plate.   
   
   
       15 . An air conditioner comprising:
 a rotary compressor which compresses a coolant, the rotary compressor comprising:   a rotation shaft;   a driving motor which is coupled to a first side of the rotation shaft to supply a rotation force;   a cylinder under the driving motor and having a rolling piston rotating therein;   a rotation cam which is eccentrically provided to a second side of the rotation shaft and supports the rolling piston;   an upper radial bearing and a lower radial bearing which are provided to an upper part and a lower part of the rolling piston respectively to support the rotation shaft in a radial direction thereof; and   an axial supporting part which comprises a first supporting member which is provided between the driving motor and the upper radial bearing, and a second supporting member which is provided between the rotation cam and the lower radial bearing.   
   
   
       16 . The air conditioner according to  claim 15 , wherein the axial supporting part supports an axial load of the rotation shaft when the rotation shaft rotates, and
 the upper radial bearing is distanced from the rotation cam when the axial supporting part is coupled to the rotation shaft.   
   
   
       17 . The air conditioner according to  claim 15 , wherein the first supporting member and the second supporting member respectively comprise a thrust ball bearing, and a pair of thrust rings which are rotatably contacted to the thrust ball bearing on opposite sides of the thrust ball bearing. 
   
   
       18 . An air conditioner comprising:
 a rotary compressor which compresses a coolant, the rotary compressor comprising:   a rotation shaft;   a driving motor which is coupled to a first side of the rotation shaft to supply a rotation force;   a cylinder under the driving motor having a first rolling piston and second rolling piston rotating therein;   a first rotation cam and a second rotation cam which are eccentrically provided to a second side of the rotation shaft and support the first rolling piston and the second rolling piston;   an upper radial bearing and a lower radial bearing which are provided to an upper part of the first rolling piston and a lower part of the second rolling piston respectively to support the rotation shaft in a radial direction thereof; and   an axial supporting part which comprises a first supporting member which is provided between the driving motor and the upper radial bearing, and a second supporting member which is provided between the second rotation cam and the lower radial bearing.   
   
   
       19 . The air conditioner according to  claim 18 , wherein the axial supporting part supports an axial load of the rotation shaft when the rotation shaft rotates, and the upper radial bearing is distanced from the first rotation cam when the axial part is coupled to the rotation shaft. 
   
   
       20 . The air conditioner according to  claim 15 , further comprising a middle plate which is interposed between the first rotation cam and the second rotation cam,
 wherein at least one of the first rotation cam and the second rotation cam are distanced from the middle plate.