Compressor and Power Transmission Device

Abstract

A compressor of the present invention having an electromagnetic clutch ( 14 ) for transmitting a driving force from a driving source ( 15 ) to a rotary shaft ( 4 ), in which the clutch ( 14 ) includes a rotor ( 16 ) rotated by receiving the driving force of the driving source ( 15 ), the rotor ( 16 ) containing an electromagnetic solenoid ( 22 ), a hub ( 48 ) fixed to the rotary shaft ( 4 ), and a clutch mechanism ( 24 ) capable of connecting the rotor ( 16 ) and the hub ( 48 ) to each other; the clutch mechanism ( 24 ) has an armature ( 26 ) attracted to the rotor ( 16 ) when the solenoid ( 22 ) is in an operating state, an inner support ( 31 ) coupled to the hub ( 48 ), and a shim ( 62 ) sandwiched between the inner support ( 31 ) and the hub ( 48 ); and the shim ( 62 ) determines the size of a gap (L) to be secured between the rotor ( 16 ) and the armature ( 26 ) when the solenoid ( 22 ) is in a resting state.

1 . A compressor comprising:
 a housing;   a rotary shaft rotatably supported in said housing, said rotary shaft having one end protruding from said housing;   a compression unit contained in said housing, said compression unit for performing a sequence of processes, starting with suction of a working fluid, followed by compression and discharge of the working fluid, when driven by said rotary shaft;   a shaft sealing unit disposed between said housing and said rotary shaft, for airtightly sealing the inside of said housing; and   a power transmission device for transmitting a driving force from a driving source to the one end of said rotary shaft, wherein   said power transmission device includes:   a rotor rotatably supported by an outer surface of said housing through a bearing, for receiving the driving force from the driving source;   a hub coupled to the one end of said rotary shaft, for rotating with said rotary shaft;   a clutch mechanism for controlling transmission of rotational force from the rotor to the hub, the clutch mechanism including a first rotation member disposed adjacent to the rotor in relation to an axial direction of said rotary shaft, the first rotation member being capable of receiving the rotational force of the rotor, and a second rotation member disposed adjacent to the hub in relation to the axial direction, the second rotation member being coupled to the hub and capable of receiving the rotational force of the first rotation member; and   a shim sandwiched between the second rotation member and the hub, the shim determining a position of the first rotation member with respect to the rotor in the axial direction.   
   
   
       2 . The compressor according to  claim 1 , wherein:
 said power transmission device is an electromagnetic clutch including an electromagnetic solenoid disposed within the rotor, wherein:   the first rotation member of the clutch mechanism includes:   an armature for receiving the rotational force of the rotor when the electromagnetic solenoid is in an operating state and the armature is attracted to the rotor by the electromagnetic solenoid, and   a spring element for urging the armature to secure a gap between the rotor and the armature in the axial direction when the electromagnetic solenoid is in a resting state, and wherein:   the shim determines a size of the gap.   
   
   
       3 . The compressor according to  claim 1 , wherein:
 said power transmission device is a torque limiter for breaking transmission of the rotational force from the rotor to said rotary shaft when said rotary shaft comes into a locked state, wherein:   the first rotation member of the clutch mechanism includes a spring element connected to the rotor, and wherein:   the shim secures a gap between the rotor and the spring element in the axial direction.   
   
   
       4 . The compressor according to  claim 1 , wherein:
 the clutch mechanism further includes a fastening element disposed in either one of the second rotation member and the hub, and a receiving element disposed in the other of the second rotation member and the hub, for receiving the fastening element to couple the second rotation member and the hub to each other, and wherein:   the shim has a bore into which the fastening element is inserted.   
   
   
       5 . The compressor according to  claim 4 , wherein:
 the fastening element is any one of a bolt, a pin, and a protruding portion integrally formed in one or the other of the second rotation member and the hub.   
   
   
       6 . The compressor according to  claim 1 , wherein:
 the working fluid includes CO 2  gas.   
   
   
       7 . A power transmission device for transmitting a driving force from a driving source to a rotary shaft, comprising:
 a rotor rotatably disposed so as to be coaxial with the rotary shaft, for receiving the driving force from the driving source;   a hub coupled to the rotary shaft, for rotating with the rotary shaft;   a clutch mechanism for controlling transmission of rotational force from said rotor to said hub, said clutch mechanism including a first rotation member disposed adjacent to said rotor in relation to an axial direction of the rotary shaft, the first rotation member being capable of receiving the rotational force of said rotor, and a second rotation member disposed adjacent to said hub in relation to the axial direction, the second rotation member being coupled to said hub and capable of receiving rotational force of the first rotation member; and   a shim sandwiched between the second rotation member and said hub, said shim determining a position of the first rotation member with respect to said rotor in the axial direction, wherein:   the power transmission means is an electromagnetic clutch in which the rotor facing portion includes a clutch plate, the transmission body has an armature body, and the clutch plate is attracted to the rotor by power supply, and wherein:   the shim adjusts an axial position of the clutch plate.   
   
   
       8 . The power transmission device according to  claim 7 , wherein:
 the power transmission device is an electromagnetic clutch including an electromagnetic solenoid disposed within said rotor, wherein:   the first rotation member of said clutch mechanism includes:   an armature for receiving the rotational force of said rotor when the electromagnetic solenoid is in an operating state and the armature is attracted to said rotor; and   a spring element for urging the armature to secure a gap between said rotor and the armature in the axial direction when the electromagnetic solenoid is in a resting state, and wherein:   the shim determines a size of the gap.   
   
   
       9 . The power transmission device according to  claim 7 , wherein:
 the power transmission device is a torque limiter for breaking transmission of the rotational force from said rotor to the rotary shaft when the rotary shaft comes into a locked state, wherein:   the first rotation member of said clutch mechanism includes a spring element connected to the rotor, and wherein:   the shim secures a gap between said rotor and the spring element in the axial direction.   
   
   
       10 . The power transmission device according to  claim 7 , wherein:
 said clutch mechanism further includes a fastening element disposed in either one of the second rotation member and said hub, and a receiving element disposed in the other of the second rotation member and said hub, and receives the fastening element to couple the second rotation member and said hub to each other, and wherein:   the shim has a bore into which the fastening element is inserted.   
   
   
       11 . The power transmission device according to  claim 10 , wherein:
 the fastening element is any one of a bolt, a pin, and a protruding portion integrally formed in one or the other of the second rotation member and said hub.