Compressor

Abstract

A compressor includes a compressor main body and a power transmission mechanism. The power transmission mechanism includes a pulley and a hub. The pulley has a first inner cylinder and a second inner cylinder, which are apart from each other in the axial direction of the pulley. A one-way clutch is located on a power transmission path between the first inner cylinder and the hub. A bearing is located between the first inner cylinder and the hub. A bearing is located between the second inner cylinder and a housing of the compressor main body. A power transmission pin for discontinuing an excessive power transmission is located on a power transmission path between an engine of a vehicle and a drive shaft.

1 . A compressor, comprising: 
 a compressor main body, wherein the compressor main body includes a housing and a drive shaft, which is supported by the housing, and wherein the compressor main body compresses refrigerant in accordance with rotation of the drive shaft;    an electric part, wherein the electric part at least functions as a motor;    a first rotating body, wherein the first rotating body is rotated by an external drive source;    a second rotating body secured to the drive shaft to rotate integrally with the drive shaft, wherein the second rotating body is operably coupled to the first rotating body, and wherein power is directly transmitted from the electric part to the second rotating body;    a first cylinder and a second cylinder located on the first rotating body, wherein the first cylinder and the second cylinder are apart from each other;    a one-way clutch located on a power transmission path between the first cylinder and the second cylinder;    a first ball bearing located between the first cylinder and the second rotating body;    a second ball bearing located between the second cylinder and the housing; and    a discontinuing mechanism located on a power transmission path between the external drive source and the drive shaft, wherein the discontinuing mechanism discontinues excessive torque transmission from the external drive source to the drive shaft.    
     
     
         2 . The compressor according to  claim 1 , further comprising an elastic member for absorbing misalignment between the axis of the first ball bearing and the axis of the second ball bearing.  
     
     
         3 . The compressor according to  claim 1  or  2 , wherein the discontinuing mechanism includes a breakable member, and wherein the breakable member breaks when torque transmitted from the external drive source to the drive shaft is excessive.  
     
     
         4 . The compressor according to  claim 3 , wherein the breakable member is made of sintered metal or low-carbon steel.  
     
     
         5 . The compressor according to  claim 3  or  4 , wherein at least part of the first rotating body or at least part of the second rotating body functions as the breakable member.  
     
     
         6 . The compressor according to  claim 5 , wherein at least one of the first rotating body and the second rotating body has an upstream rotating body and a downstream rotating body, wherein the upstream rotating body is located upstream of the downstream rotating body in the power transmission path between the external drive source and the drive shaft, and wherein the breakable member is located in a power transmission path between the upstream rotating body and the downstream rotating body.  
     
     
         7 . The compressor according to any one of  claims 1  to  6 , wherein the first ball bearing has a plurality of rolling elements arranged in a line in the circumferential direction of the first ball bearing.  
     
     
         8 . The compressor according to any one of  claims 1  to  7 , wherein the electric part is located inside the first rotating body.  
     
     
         9 . The compressor according to  claim 8 , wherein the first cylinder and the second cylinder are separate from each other in the axial direction of the first rotating body.  
     
     
         10 . The compressor according to any one of  claims 1  to  9 , wherein the compressor main body is designed such that the discharge displacement per one rotation of the drive shaft can be varied.  
     
     
         11 . The compressor according to  claim 10 , wherein the compressor main body is connected to an external refrigerant circuit, and wherein the compressor main body and the external refrigerant circuit form a refrigerant circuit, the compressor main body includes: 
 a control pressure zone, wherein the discharge displacement per one rotation of the drive shaft is varied in accordance with the pressure in the control pressure zone;    a pressure control passage, wherein the pressure control passage connects the control.pressure zone to a pressure zone, which is exposed to pressure that is different from the pressure in the control pressure zone; and    a control valve located in the pressure control passage, wherein the control valve adjusts the opening degree of the pressure control passage to control the pressure in the control pressure zone.    
     
     
         12 . The compressor according to  claim 11 , wherein the control valve includes: 
 a valve body;    a pressure sensing member, wherein the pressure sensing member is displaced in accordance with the pressure difference between two pressure monitoring points located in the refrigerant circuit, wherein the pressure sensing member moves the valve body in accordance with the pressure difference, and wherein the discharge displacement per one rotation of the drive shaft is varied to cancel the fluctuation of the pressure difference; and    an actuator, wherein the actuator urges the pressure sensing member in accordance with an external command, and wherein the force of the actuator exerted against the pressure sensing member reflects a target value of the pressure difference.    
     
     
         13 . The compressor according to any one of  claims 10  to  12 , wherein the compressor main body is designed such that the discharge displacement per one rotation of the drive shaft can be varied to substantially zero.