| 摘要 |
<p>PURPOSE: To prevent operational failure of refrigerant compressor, even when non/off operation of the compressor is frequent, and reduce power loss of an engine at time of not opening the refrigerating cycle. CONSTITUTION: A refrigerant compressor 16 is driven by a hydraulic motor 23 operated with oil pressure occurring in a hydraulic pump driven by an engine 21. A bypass route 26 for bypassing the hydraulic pump 22 is disposed in a hydraulic circuit 26 leading the occurring oil pressure to the hydraulic motor 23. An opening/closing valve 27 for closing the bypass route 26 only when an air-conditioning switch 31 is on, is disposed in the bypass route 26. When the air-conditioning switch 31 is on, the coolant compressor 16 is controlled in operation by means of on/off of an electromagnetic clutch 32, so that operation failure of the coolant compressor 16 is suppressed. In time of not using the freezing cycle 4, the air-conditioning switch 31 is turned off, so that oil pressure is not led to the hydraulic motor 23, and thus power loss of the engine 21 is suppressed.</p> |
