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Refrigerating compressor with breakaway pulley portion
| Details |
Inventors: Eitai, Kazuo; Kanaizuka, Minoru; Ishida, Hiroyuki; Kumagai, Shuzo; Kobayashi, Tadashi;
Assignee: Zexel Corporation (Tokyo, JP)
Primary Examiner: Izaguirre; Ismael
Assistant Examiner:
Attorney, Agent or Firm: Frishauf, Holtz, Goodman, Langer & Chick
A refrigerant compressor includes a drive shaft, a pulley fixedly fitted on the drive shaft, over which is passed a torque-transmitting member for transmitting torque from an external drive source to the drive shaft, and a compression rotational member mounted on the drive shaft for rotation in unison with the drive shaft to enable compression of a refrigerant gas. The pulley has a rim in the form of a hollow cylinder, over which is passed the torque-transmitting member, a boss which is fixedly fitted on the drive shaft, and a support member connecting the rim and the boss. A breakaway portion is provided in the support member or the drive shaft for breaking to disconnect the torque-transmitting member from the compression rotational member when a load torque larger than a predetermined value is applied to the breakaway portion. A bearing is arranged on the pulley for receiving tension of the torque-transmitting member to thereby maintain the rim in a rotating state when the torque-transmitting member is disconnected from the compression rotational member by breaking of the breakaway portion. |
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DETAILED DESCRIPTION It is an object of the invention to provide a refrigerant compressor which does not impair the functions of other auxiliary machines of an engine and is capable of preventing occurrence of a fire of an automotive vehicle on which the engine is installed, when the refrigerant compressor is disabled from rotation.
To attain the above object, according to a first aspect of the invention, there is provided a refrigerant compressor including a drive shaft, a pulley fixedly fitted on the drive shaft, over which is passed a torque-transmitting member for transmitting torque from an external drive source to the drive shaft, and a compression rotational member mounted on the drive shaft for rotation in unison with the drive shaft to enable compression of a refrigerant gas.
The pulley has a rim in the form of a hollow cylinder, over which is passed the torque-transmitting member, a boss which is fixedly fitted on the drive shaft, and a support member connecting the rim and the boss.
The refrigerant compressor according to the first aspect of the invention is characterized by comprising a breakaway portion provided in the support member for breaking to disconnect the torque-transmitting member from the compression rotational member when a load torque larger than a predetermined value is applied to the breakaway portion, and a bearing arranged on the pulley for receiving tension of the torque-transmitting member to thereby hold the rim in a rotating state when the torque-transmitting member is disconnected from the compression rotational member by breaking of the breakaway portion.
According to the refrigerant compressor of the first aspect of the invention, when the compression rotational member is disabled from rotation, the breakaway portion of the pulley breaks to disconnect the torque-transmitting member from the compression rotational member.
On the other hand, the rim of the pulley continues to rotate on the bearing, whereby it is possible to prevent the functions of the other auxiliary machines driven via the torque-transmitting member, such as an alternator and an oil pump, from being impaired
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