Rotor and compressor

Abstract

A rotor has a main body including a rotation axis, a weight guide recessed in the main body, said weight guide having a weight guide surface and a weight that is accommodated in the weight guide and contacts with and rolls on a weight guiding surface. The weight swings like a pendulum about a second axis. The second axis is parallel to and offset from the rotation axis. The weight guiding surface guides the weight to keep the weight moving within the guiding surface.

1 . A rotor comprising: 
 a main body having a rotation axis;    a weight guide recessed in the main body, said weight guide having a weight guide surface; and    a weight that is accommodated in the weight guide and contacts with and rolls on a weight guiding surface, wherein the weight swings like a pendulum about a second axis, and wherein the second axis is parallel to and offset from the rotation axis;    wherein the weight guiding surface guides the weight to keep the weight moving within the guiding surface.    
     
     
         2 . The rotor according to  claim 1 , wherein the weight guide surface has a U-shaped cross-sectional surface along a plane that contains the second axis.  
     
     
         3 . The rotor according to  claim 1 , wherein the weight guide surface has an inclined cross-sectional surface along a plane that contains the second axis.  
     
     
         4 . The rotor according to  claim 1 , wherein an annular groove or an annular projection is formed in the circumferential portion of the weight, and wherein a weight guiding path engaging with the circumferential portion of the weight is formed in the weight guiding surface, the weight guiding path being a projection or a groove.  
     
     
         5 . The rotor according to  claim 4 , wherein an inclined section is formed in at least part of the weight guiding surface, and wherein the weight guiding surface includes an inclined section.  
     
     
         6 . The rotor according to  claim 4 , wherein the weight guiding path on the weight guiding surface is a projection, and wherein the circumferential portion of the weight has an annular groove.  
     
     
         7 . A rotor comprising: 
 a main body having a rotation axis;    a weight guide formed in the main body, said weight guide having an arcuate shape in a cross-section along a plane perpendicular to the rotation axis; and    a weight accommodated in the weight guide, the weight having a circular cross-section, wherein the weight rolls along a weight guiding surface and swings like a pendulum about a second axis, and wherein the second axis is separated from the rotation axis by a predetermined distance and is parallel to the rotation axis;    wherein the weight guiding surface has a portion that contacts the weight, wherein said contacting portion has a cross-sectional surface along a plane containing the second axis, said cross-section surface being substantially U-shaped such that the weight is prevented from moving toward the second axis.    
     
     
         8 . The rotor according to  claim 7 , wherein an annular groove or an annular projection is formed in the circumferential portion of the weight, and wherein a weight guiding path engaging with the circumferential portion of the weight is formed in the weight guiding surface, the weight guiding path being a projection or a groove.  
     
     
         9 . The rotor according to  claim 8 , wherein an inclined section is formed in at least part of the weight guiding surface, and wherein weight guiding surface includes an inclined section.  
     
     
         10 . The rotor according to  claim 8 , wherein the weight guiding path on the weight guiding surface is a projection, and wherein the circumferential portion of the weight has an annular groove.  
     
     
         11 . A rotor comprising: 
 a main body haning a rotation axis;    a weight guide formed in the main body, said weight guide having an arcuate shape in a cross-section along a plane perpendicular to the rotation axis;    a weight accommodated in the weight guide, the weight having a circular cross-section, wherein the weight rolls along a weight guiding surface and swings like a pendulum about a second axis, and wherein the second axis is separated from the rotation axis by a predetermined distance and is parallel to the rotation axis;    wherein the weight guiding surface has a portion that contacts the weight, wherein the contacting portion has a cross-sectional surface along a plane containing the second axis, said cross-section surface being substantially U-shaped such that the weight is prevented from moving toward the second axis;    an annular groove or an annular projection formed in the circumferential portion of the weight; and    a weight guiding path formed in the weight guiding surface, the weight guiding path engaging with the circumferential portion of the weight, wherein the weight guiding path being a projection or a groove.    
     
     
         12 . The rotor according to  claim 11 , wherein an inclined section is formed in at least part of the weight guiding surface, and wherein the weight guiding surface includes an inclined section.  
     
     
         13 . The rotor according to  claim 12 , wherein the weight guiding path on the weight guiding surface is a projection, and wherein the circumferential portion of the weight has an annular groove.  
     
     
         14 . A compressor driven by power of a vehicle engine, comprising: 
 a pulley receiving power from the engine;    a weight guide formed in the pulley, wherein the weight guide has an arcuate shape in a cross-section along a plane perpendicular to the rotation axis; and    a weight accommodated in the weight guide, the weight having a circular cross-section, wherein the weight rolls along a weight guiding surface and swings like a pendulum about a second axis, and wherein the second axis is separated from the rotation axis by a predetermined distance and is parallel to the rotation axis;    wherein the weight guiding surface has a portion that contacts the weight, wherein the contacting portion has a cross-sectional surface along a plane that contains the second axis, the cross-section surface being inclined relative to the second axis such that the weight is prevented from moving toward the second axis.    
     
     
         15 . The compressor according to  claim 14 , wherein the cross-section surface of the contacting portion is substantially U-shaped.  
     
     
         16 . The compressor according to  claim 14 , wherein an annular groove or an annular projection is formed in the circumferential portion of the weight, and wherein a weight guiding path engaging with the circumferential portion of the weight is formed in the weight guiding surface, the weight guiding path being a projection or a groove.  
     
     
         17 . The compressor according to  claim 16 , wherein an inclined section is formed in at least part of the weight guiding surface, and wherein the weight guiding surface includes an inclined section.  
     
     
         18 . A rotor comprising: 
 a main body having a rotation axis;    a weight guide formed in the main body, said weight guide having an arcuate shape in a cross-section along a plane perpendicular to the rotation axis, said weight guide having a weight guide surface; and    a weight accommodated in the weight guide, the weight having a circular cross-section, wherein the weight rolls along a weight guiding surface and swings like a pendulum about a second axis, and wherein the second axis is separated from the rotation axis by a predetermined distance and is parallel to the rotation axis;    wherein the weight guiding surface has a portion that contacts the weight, wherein said contacting portion has a cross-sectional surface along a plane that contains the second axis, said cross-sectional surface is inclined relative to the second axis such that the weight is prevented from moving in the direction of the second axis.