Zexel Gmbh

Shuzo Kumagai

Minoru Kanaizuka

Hiroyuki Ishida

Kazuo Eitai

Tadashi Kobayashi

Hidetoshi Arahata

Syouji Shimada

Syoiti Fukuda

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.

Refrigerating compressor with breakaway pulley portion

An annular piston abuts on an end face of a rotation plate on a side remote from a hollow cylinder via a thrust bearing, and delivery pressure is introduced to an end face of an annular piston on a side remote from the rotation plate via a high pressure-introducing passage. The delivery pressure acts via the thrust bearing on the rotation plate to urge the rotation plate toward the cylinder. As a result, the gap between the rotation plate and the cylinder is reduced, while a friction resistance offered to the rotation plate is reduced, thereby permitting the smooth rotation of the rotation plate.

Variable capacity vane compressor

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Kounan, Japan

Shuzo Kumagai